1. A method for use by a system including a processor, the method comprising: receiving, by the processor, a first image data representing a first field of view of a first video camera; receiving a second image data representing a second field of view of a second video camera, wherein the second field of view is non-overlapping the first field of view; determining a motion representing each of at least four trajectories moving between the first field of view and the second field of view; and computing a relative pose between the first video camera and the second video camera using the motion, wherein the computing includes backprojecting a plurality of foot position points onto a ground plane, and determining if the backprojected plurality of foot position points matches the motion.