Resulting from T123639
By making use of TimedMediaHandler (TMH) in Wikispeech we avoid duplicate loading, support file type alternates (such as the ogg shim for Safari, Edge, and IE), and generally use a consistent player style.
To make use of Video.js instead of Kaltura set config variable wgTmhWebPlayer = 'videojs'
Video.js fully mirrors the HTML5 <video> element api.
Investigate whether it's possible to use the GUI for Wikispeech (would probably need some customization).