Add support for Brightcove videos

Please consider adding support for Brightcove.com videos as Brightcove is not an oEmbed provider.

https://studio.support.brightcove.com/publish/choosing-correct-embed-cod...

Example url:
Long version: https://players.brightcove.net/6314321213001/default_default/index.html?...
Short version: https://bcove.video/3BD5ydj

Example Standard Embed Code: 960 x 540 (Responsive)

<div style="position: relative; display: block; max-width: 960px;"><div style="padding-top: 56.25%;"><iframe src="https://players.brightcove.net/6314321213001/default_default/index.html?videoId=6310428365112" allowfullscreen="" allow="encrypted-media" style="position: absolute; top: 0px; right: 0px; bottom: 0px; left: 0px; width: 100%; height: 100%;"></iframe></div></div>

Example Advanced Embed Code: 960 x 540 (Responsive)
<div style="max-width: 960px; position: relative;"><div style="padding-top: 56.25%;"><video-js data-account="6314321213001" data-player="default" data-embed="default" controls="" data-video-id="6310428365112" data-playlist-id="" data-application-id="" class="vjs-fill" style="top:0; position:absolute; max-height: 540px;"></video-js></div><script src="https://players.brightcove.net/6314321213001/default_default/index.min.js"></script></div>