Embed test:
<object width="480" height="295"><param name="movie" value="http://www.youtube.com/v/gzwacoEr7ns&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/gzwacoEr7ns&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="295"></embed></object>
Url test:
http://www.youtube.com/watch?v=gzwacoEr7ns
Tagged url test
http://www.youtube.com/watch?v=gzwacoEr7ns