Apparatus for verifiable outputting images, comprising: a monitor for outputting images based on image data, a plurality N of camera devices (30, 40, 50), with N ≥ 2, wherein each one of the N camera devices (30, 40, 50) has a camera (31, 41, 51) for providing image data (B1, B2, B3) based on recording of at least one camera image and an integration unit (32, 42, 52) for outputting extended image data (E1, E2, E3) based on an integration of a camera-specific display element (A1, A2, A3) into the provided image data (B1, B2, B3), and a multiplexer device coupled between the N camera devices (30, 40, 50) and the monitor, which is configured to provide selected further image data out of the extended image data (E1, E2, E3) received from the N camera devices (30, 40, 50) on the output side for the monitor in dependence on a current user command entered by a user of the monitor, wherein the monitor is configured to output an image with the camera-specific display element in an output area of the monitor based on the extended image data provided by the multiplexer device, wherein the apparatus further comprises: an analysis unit configured to determine an analysis result for detecting the camera (31, 41, 51) providing the image data based on an analysis of the specific display element (A1, A2, A3) within the extended image data provided by the multiplexer device, and a comparison unit for comparing the analysis result determined by the analysis unit with the current entered user command for selecting one of the N cameras (31, 41, 51). a monitor for outputting images based on image data, a plurality N of camera devices (30, 40, 50), with N ≥ 2, wherein each one of the N camera devices (30, 40, 50) has a camera (31, 41, 51) for providing image data (B1, B2, B3) based on recording of at least one camera image and an integration unit (32, 42, 52) for outputting extended image data (E1, E2, E3) based on an integration of a camera-specific display element (A1, A2, A3) into the provided image data (B1, B2, B3), and a multiplexer device coupled between the N camera devices (30, 40, 50) and the monitor, which is configured to provide selected further image data out of the extended image data (E1, E2, E3) received from the N camera devices (30, 40, 50) on the output side for the monitor in dependence on a current user command entered by a user of the monitor, wherein the monitor is configured to output an image with the camera-specific display element in an output area of the monitor based on the extended image data provided by the multiplexer device, wherein the apparatus further comprises: an analysis unit configured to determine an analysis result for detecting the camera (31, 41, 51) providing the image data based on an analysis of the specific display element (A1, A2, A3) within the extended image data provided by the multiplexer device, and a comparison unit for comparing the analysis result determined by the analysis unit with the current entered user command for selecting one of the N cameras (31, 41, 51). an analysis unit configured to determine an analysis result for detecting the camera (31, 41, 51) providing the image data based on an analysis of the specific display element (A1, A2, A3) within the extended image data provided by the multiplexer device, and a comparison unit for comparing the analysis result determined by the analysis unit with the current entered user command for selecting one of the N cameras (31, 41, 51).