I have tried a few of the degradeable html5 plugins and this one seems to work the best in all of the browsers I tried it in.
Well done!
One slight disappointment - it seems that when I include a poster, this is not transferred to the Flash settings.... so that browsers which end up with Flash (still the majority in today's world!) don't see the poster, but just a start of the video which may well be a blank screen...
Any chance of fixing that up?
Thanks!
http://wordpress.org/extend/plugins/videojs-html5-video-player-for-wordpress/