An adaptive system for automatic tracking of a target in at least one video stream, comprising: - at least one dynamically configurable tracking device (14 1,..., 14 n), receiving said at least one video stream, adapted for detection and automatic tracking of at least one target by analysis of said at least one video stream, - a calculator to determine a first performance metric value and at least one second performance metric value of said at least one tracking device (14 1,..., 14 n), - a corrector of at least one configuration parameter of said at least one tracking device (14 1,..., 14 n) as a function of said performance metric values, - at least one dynamic configurator (16 1,..., 16 n) of said at least one tracking device (14 1,..., 14 n) by application of said at least one corrected configuration parameter, and characterized in that it further comprises at least one measurement device (18 1,..., 18 n) for measurement of at least one value representative of a demand for hardware resources by said at least one tracking device (14 1,..., 14 n), the adaptive system for automatic tracking further comprising an additional reference tracking device (14 MSTR) and a collector, the collector being configured to: - collect the at least one video stream for transmission to the at least one respective tracking device (14 1,..., 14 n); and - successively select, according to any predetermined algorithmic selection rule, respective portions (P 1,..., P n) of the at least one video stream, and to transmit them to the additional reference tracking device (14 MSTR), the additional reference tracking device (14 MSTR) being adapted for detection and tracking of at least one target by analysis of said portions (P 1,..., P n), the calculator comprising: - a first module designed to calculate the first performance metric value based on a comparison, on each of the portions (P 1,..., P n), of target tracking results (R 1,..., R n) respectively provided by the tracking devices (14 1,..., 14 n) on said portions (P 1,..., P n) and of target tracking results (S 1,..., S n) successively provided by the reference additional tracking device (14 MSTR) on the same portions; and - a second module adapted to calculate said at least one second performance metric value starting from said at least one value measured by the at least one measurement device (18 1,..., 18 n). - at least one dynamically configurable tracking device (14 1,..., 14 n), receiving said at least one video stream, adapted for detection and automatic tracking of at least one target by analysis of said at least one video stream, - a calculator to determine a first performance metric value and at least one second performance metric value of said at least one tracking device (14 1,..., 14 n), - a corrector of at least one configuration parameter of said at least one tracking device (14 1,..., 14 n) as a function of said performance metric values, - at least one dynamic configurator (16 1,..., 16 n) of said at least one tracking device (14 1,..., 14 n) by application of said at least one corrected configuration parameter, and characterized in that it further comprises at least one measurement device (18 1,..., 18 n) for measurement of at least one value representative of a demand for hardware resources by said at least one tracking device (14 1,..., 14 n), the adaptive system for automatic tracking further comprising an additional reference tracking device (14 MSTR) and a collector, the collector being configured to: - collect the at least one video stream for transmission to the at least one respective tracking device (14 1,..., 14 n); and - successively select, according to any predetermined algorithmic selection rule, respective portions (P 1,..., P n) of the at least one video stream, and to transmit them to the additional reference tracking device (14 MSTR), - collect the at least one video stream for transmission to the at least one respective tracking device (14 1,..., 14 n); and - successively select, according to any predetermined algorithmic selection rule, respective portions (P 1,..., P n) of the at least one video stream, and to transmit them to the additional reference tracking device (14 MSTR), the additional reference tracking device (14 MSTR) being adapted for detection and tracking of at least one target by analysis of said portions (P 1,..., P n), the calculator comprising: - a first module designed to calculate the first performance metric value based on a comparison, on each of the portions (P 1,..., P n), of target tracking results (R 1,..., R n) respectively provided by the tracking devices (14 1,..., 14 n) on said portions (P 1,..., P n) and of target tracking results (S 1,..., S n) successively provided by the reference additional tracking device (14 MSTR) on the same portions; and - a second module adapted to calculate said at least one second performance metric value starting from said at least one value measured by the at least one measurement device (18 1,..., 18 n). - a first module designed to calculate the first performance metric value based on a comparison, on each of the portions (P 1,..., P n), of target tracking results (R 1,..., R n) respectively provided by the tracking devices (14 1,..., 14 n) on said portions (P 1,..., P n) and of target tracking results (S 1,..., S n) successively provided by the reference additional tracking device (14 MSTR) on the same portions; and - a second module adapted to calculate said at least one second performance metric value starting from said at least one value measured by the at least one measurement device (18 1,..., 18 n).