About determind object in video matlab

Hi everyone, I'm trying to write a program to determined objects from a stationary camera like this. http://www.mathworks.com/help/vision/examples/motion-based-multiple-object-tracking.html

Now I can play video each a frame, but I don't know how to play video like this and so on

After that , What should I do to detection object in a box like picture?

[Dima Lisin]

Not sure what you mean. Could you please clarify what you are having trouble with?