<video poster="movie.jpg" controls>
<source src="movie.webm" type='video/webm; codecs="vp8.0, vorbis"'>
<source src="movie.ogg" type='video/ogg; codecs="theora, vorbis"'>
<source src="movie.mp4" type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"'>
<p>This is fallback content</p>
</video>
There are some free software available which can convert any video format to
HTML5 video format. You can download Miro Video Converter to convert almost any video to MP4, WebM (vp8), Ogg Theora, or for Android, iPhone, and iPad.