Since your linked site uses vimeo, I’ll direct you here: http://vimeo.com/api/docs/player-js
A stop (pause) is as simple as:
document.getElementById('myViddy').pause(); //for <object>-style embed
and
document.getElementById('myIFrame').postMethod({"method": "pause"}); //for <iframe>-style embed
solved create a stop with Jquery for viemo embedded video [duplicate]