A system for checking security of video surveillance of an area by a plurality of video units includes: (a) a respective signaling unit coupled with each of a respective signaling-equipped video unit among the plurality of video units; and (b) a control unit coupled with each respective video unit of the plurality of video units; the control unit providing an encoding arrangement for use by each respective signaling unit for emitting a predetermined signal. Each respective signaling-equipped video unit is oriented to permit at least one other video unit of the plurality of video units to receive the predetermined signal. The control unit cooperates with the plurality of video units to evaluate received the predetermined signals to effect the checking.