1. A mobile input and sensor device for a computer controlled video system, the computer-controlled video system comprising a display device for displaying video pictures to at least one user and at least one remote computing device executing a software application for providing output data to be transmitted via a network to the display device to display the video pictures, wherein the mobile input and sensor device is wirelessly linked to the at least one remote computing device, the mobile input and sensor device comprising: a sensor module including at least one optical sensory element being directed towards the user, configured to detect user activities and produce sensor signals; at least one input element; at least one wireless interface configured to transmit user-related input data via the network to said at least one remote computing device; a further wireless interface configured to receive further input data from external user control devices; a processing unit configured to combine and process the further input data with said sensor signals to generate said user-related input data representing said detected user activities; and a visual projection module configured to output visual data to said at least one user as a feedback from the at least one remote computing device, wherein the mobile input and sensor device is held by the at least one user in front of said display device of the computer-controlled video system and is configured to provide the user-related input data via the network to be processed by said software application executed on the at least one remote computing device.