Found a solution, got observing Facebook code.
Basically, instead of using iframe to embed youtube video, I'm using the <embed>
tag, like the following code:
<embed wmode="opaque" salign="tl" allowscriptaccess="never" allowfullscreen="true" scale="scale" quality="high" bgcolor="#FFFFFF" name="swf_u_jsonp_2_2b" id="swf_u_jsonp_2_2b" style="display: block;" src="https://www.youtube.com/v/XvLAKrVbCBM?version=3&autohide=1" type="application/x-shockwave-flash">