A video monitoring system including a camera unit, comprising a camera arranged to monitor a scene, a sensor unit, arranged to detect motion in a plurality of predetermined scene regions (202a-f), a video encoding unit, comprising a first data input arranged to receive a video stream with a plurality of image frames from the camera, a second data input arranged to receive sensor data from the sensor unit, a processing unit arranged to generate an overlay representing the sensor data and add the overlay to the image frames in the video stream to generate an encoded video stream which represents the scene in two different ways in every image frame, wherein the overlay has a plurality of overlay regions (206a-f) each representing a corresponding scene region, wherein the overlay includes a graphical element in those overlay regions which represent scene regions in which the motion sensor data indicates that motion was detected by the motion sensor unit, wherein the camera unit is arranged to output the encoded video stream generated by the processing unit, a video management system, comprising a third data input arranged to receive the encoded video stream from the camera unit, a video analytics unit arranged to analyze the encoded video stream and to generate an event when an object is detected in a scene region and a graphical element is detected at the same time in an overlay region representing that scene region. a camera unit, comprising a camera arranged to monitor a scene, a sensor unit, arranged to detect motion in a plurality of predetermined scene regions (202a-f), a video encoding unit, comprising a first data input arranged to receive a video stream with a plurality of image frames from the camera, a second data input arranged to receive sensor data from the sensor unit, a processing unit arranged to generate an overlay representing the sensor data and add the overlay to the image frames in the video stream to generate an encoded video stream which represents the scene in two different ways in every image frame, wherein the overlay has a plurality of overlay regions (206a-f) each representing a corresponding scene region, wherein the overlay includes a graphical element in those overlay regions which represent scene regions in which the motion sensor data indicates that motion was detected by the motion sensor unit, a camera arranged to monitor a scene, a sensor unit, arranged to detect motion in a plurality of predetermined scene regions (202a-f), a video encoding unit, comprising a first data input arranged to receive a video stream with a plurality of image frames from the camera, a second data input arranged to receive sensor data from the sensor unit, a processing unit arranged to generate an a first data input arranged to receive a video stream with a plurality of image frames from the camera, a second data input arranged to receive sensor data from the sensor unit, a processing unit arranged to generate an overlay representing the sensor data and add the overlay to the image frames in the video stream to generate an encoded video stream which represents the scene in two different ways in every image frame, wherein the overlay has a plurality of overlay regions (206a-f) each representing a corresponding scene region, wherein the overlay includes a graphical element in those overlay regions which represent scene regions in which the motion sensor data indicates that motion was detected by the motion sensor unit, wherein the camera unit is arranged to output the encoded video stream generated by the processing unit, a video management system, comprising a third data input arranged to receive the encoded video stream from the camera unit, a video analytics unit arranged to analyze the encoded video stream and to generate an event when an object is detected in a scene region and a graphical element is detected at the same time in an overlay region representing that scene region. a third data input arranged to receive the encoded video stream from the camera unit, a video analytics unit arranged to analyze the encoded video stream and to generate an event when an object is detected in a scene region and a graphical element is detected at the same time in an overlay region representing that scene region.