Microsoft is adding VP9 video playback to MS Edge; current Windows Insider editions (build 10547) include this prefed behind a switch in about:flags.
Once it's available by default, this'd be much better to use than ogv.js as a playback backend for MS Edge (native code will be faster, can make use of hardware accel, etc).
Example of such playback:
- https://www.youtube.com/watch?v=nEYrh2SKTwU&feature=youtu.be (screen cap)
Currently Opus audio is not yet included, but it may or may not arrive soon. Vorbis is on their dev backlog and may or may not arrive at some point as well.
If Opus via MSE doesn't come in, may be able to rig up audio via ogv.js, with some kind of split-brain monstrosity. ;)