i use this code and works
HTML Code:
<embed type='application/x-shockwave-flash' id='single2' name='single2' src='http://site.com/player.swf' width='728' height='380' bgcolor='#ffffff' allowscriptaccess='always' allowfullscreen='true' flashvars='file=http://www.youtube.com/v/NmTKfdPnzN0&autostart=true'/><br>