1. An apparatus comprising: a plurality of first detection devices each configured to (i) detect objects in a respective zone and (ii) generate intermediate signals in response to detecting said objects; a second detection device configured to (i) detect said objects in one or more of a plurality of segments and (ii) generate a wakeup signal in response to detecting said objects; a processor configured to (i) perform analysis of one or more frames of a video captured by an image sensor and (ii) evaluate a detection of said objects by said first detection devices and said second detection device based on said analysis; and a controller configured to (i) activate said second detection device in response to one or more of said intermediate signals, (ii) activate said processor in response to said wakeup signal and (iii) provide feedback to said first detection devices and said second detection device based on said evaluation by said processor.