It could be useful to add general support for embedding Videos from Wikimedia Commons into Remarkup.

Downstream patches that can be used as inspiration / base:

https://phabricator.wikimedia.org/rPHAB678062f1826fa70dcf2fc994d6393eb306f262e7 - Add support for embedding videos from commons into remarkup

https://phabricator.wikimedia.org/rPHAB386b86fde37631af2ee47ac8ff09498e9fd3459c - Add content-security-policy header rule for commons.wikimedia.org