Hi Roy,
The problem with HTML5 video tag is that it does not define the video format. This means that you are at the mercy of whatever the browser has chosen to implement. For VoD content most browsers and platforms have settled on MP4 files with H.264 video. For live video it is still a mess:
Chrome: mostly it will use RTSP
Safari (iOS and OSX): HLS
IE: none, unless you have the silverlight plugin, then Smooth Streaming
Firefox: changes constantly. currently RTSP with H.264 MAY work
Android: RTSP or HLS
So unfortunately there is really no one way to stream live video to "HTML5", it is all very much browser and platform specific.