The present invention is directed to methods and devices for tracking moving characteristics of at least two moving objects. The present invention identifies an occlusive condition(s) of the moving objects on a video frame(s), analyzes information of a physical framework(s) of the moving objects, finds and records a position(s) of the occluded moving object(s) on the video frames and tracks a moving character(s) of the moving objects. The present invention further provides devices and methods for tracking the moving characteristics of behaviors of living bodies.