Right now the current videojs only supports m3u8/HLS on safari and iOS. Android is supposed to support HLS, or cupertino streaming, but I have heard it is buggy. To make HLS and m3u8 work in videojs you need to provide an HLS capable flash fall back for videojs.
Check out this example http://flashls.org/videojs/flash_demo.html
To implement it yourself... follow this guide
or download this swf
then add this code to your videojs page.
<script>
videojs.options.flash.swf = "[YourHosted]/video-js.swf"
</script>
...
<video id="example_video_1" class="video-js vjs-default-skin" controls preload="none" width="640" height="360" data-setup='{"techOrder": ["flash"]}'>
<source src="http://[Wowza Ip]/live/mp4:mystream/playlist.m3u8" type='video/mp4'/>
</video>