PeerTube is the Fediverse's video platform. You can follow and interact with PeerTube accounts entirely within Mastodon if you prefer, or you can sign up on a PeerTube server if you want.
I run a website to help people explore and use PeerTube:
The website also has an account boosting interesting PeerTube videos at:
There is a long thread full of nice PeerTube accounts to follow at:
https://social.growyourown.services/@FediVideo/112037485212998386