Ok I'm pretty happy with this revision of the MediaWiki TimedMediaHandler video player dialog.
Check it out in action! https://video-testing.wmflabs.org/
Still some stuff todo, but it's a big step-up for the "beta mode" video player. Once it gets through review this'll land on Wikipedia, probably in a week or two. Next stab on it I'll make some improvements on audio handling and supporting embed/sharing.
So this mode, compared to the current default media player, has several changes:
* switches from an old unmaintained mwembed/kaltura player widget to modern video.js
* switches UI from old jquery.ui which we've deprecated elsewhere in MediaWiki, to OOUI which we use extensively
* has thumbnails which degrade to regular video players with JS disabled, instead of just pictures with links
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