实现了运动目标的检测和跟踪，使用背景差分法，帧间差分法、光流法和均值漂移的方法，能够实现很好的对运动目标的跟踪-Achieve a moving target detection and tracking, using background subtraction, inter-frame difference, optical flow method and the method of mean-shift, it is possible to achieve a good track mov