1. An apparatus for monitoring movement of objects of interest in an area, the apparatus comprising: an activity map generation circuit configured to, generate a plurality of activity maps based on video content from a plurality of cameras, each of the plurality of activity maps being indicative of relative activity of the objects of interest over time within a field of view of a camera among the plurality of cameras, and each of the plurality of cameras having a different corresponding field of view in the area, and standardize the plurality of activity maps with regard to a single common point of view; and a unified spatial activity map generation circuit configured to combine the plurality of standardized activity maps into a unified activity map.