1. A video feed processing system comprising: interface circuits to receive one or more two dimensional (“2D”) video feeds; and processing circuitry executing instructions to: track and characterize moving elements present within the scene video feed; identify and characterize static elements or objects present within the scene video feed; define a three dimensional (“3D”) coordinate set for the scene within boundaries of the scene video feed, wherein defining a three dimensional (“3D”) coordinate set includes identifying one or more substantially straight edges, indicative of the X Y or Z axes of the scene and mapping the positions of the identified and characterized static elements or objects in relation to the identified straight edges; derive coordinates and orientation of the video feed source within the scene video feed coordinate frame; update a scene element inventory with characterization information relating to identified static elements, wherein updating is performed responsive to either newly derived characterization information or to refinement of existing characterization information; detect from within the tracked and characterized moving elements one or more humans in the scene video feed; and characterize and log an event associated with a detected human; and further comprising an echo-ranging assembly in proximity with the video feed source and including one or more acoustic emitters and one or more acoustic detectors.