As part of accessibility work for GOV.UK I looked into various web video players because the currently used Nomensa video player is very outdated and has a couple of accessibility issues. I tested a few of players for mostly accessibility but also other things like web performance, design options, how well it is maintained, etc.
The outcome was that we plan to use the pure YouTube embed video player on GOV.UK while also fixing a couple of issues with it. I cannot point to anything public yet, but we will publish a blog post in due time. I have posted findings to various cross-government communities.