Hi Rich,
Animate's timelines have stop() and play() methods - but video (and audio) elements must be explicitly addressed and do not have a stop() method.
To "stop" a video on a click event, you'd use something like this:
sym.$(my_video_element)[0].pause();
To "stop it at its beginning" so that replaying it would start from the beginning, you'd use two lines of code:
sym.$(my_video_element)[0].pause();
sym.$(my_video_element)[0].currentTime = 0;
hth,
Joe