This project proposal is based on an extension I developed recently called https://www.mediawiki.org/wiki/Extension:WikiVideos that basically introduces a <wikivideo> tag that generates videos with a syntax quite similar to <gallery> tags.

I also already secured https://wikivideos.org, where you can test the extension.

Cheers!

PS: Please comment at https://meta.wikimedia.org/wiki/Wikivideos or at https://wikivideos.org (depending on the nature of your comment) to try to keep the discussion together.