Here is html5video embedded in an iframe:
Updated with a video available in mp4 format to make it work in iOS/Safari/Chrome.
Just add:
src[]=http://example.com/video.mp4&src[]=http://example.com/video.webm&
to the following and it should work everywhere with flash fallback.
<iframe src="http://html5.kaltura.org/mwEmbedFrame.php?src[]=http://cdn.kaltura.org/apis/html5lib/kplayer-examples/media/bbb_trailer_360p.webm&src[]=http://cdn.kaltura.org/apis/html5lib/kplayer-examples/media/bbb_trailer_iphone270P.m4v&src[]=http://cdn.kaltura.org/apis/html5lib/kplayer-examples/media/bbb_trailer_400p.ogv&poster=http://cdn.kaltura.org/apis/html5lib/kplayer-examples/media/bbb480.jpg" width="500" height="375" frameborder="0" ></iframe>