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If you would like to discover video accounts on the Fediverse, you might want to follow my other account FediVideo:
FediVideo boosts interesting videos (and occasionally livestreams) from across the Fediverse.
If you enjoy a particular video, follow the account that made it to see more of their videos in your timeline.
You can also search and browse tens of thousands of videos from handpicked Fediverse video accounts at https://fedi.video
p.s. If a FediGroup you want isn't listed and you want to start one, go to the application form on the front page of the FediGroup website:
️ https://about.fedigroups.social/home
Unlike Guppe, FediGroup has proper group owners and these are the people who start the groups and choose their settings. The owner can optionally moderate who is a member and optionally set the group to only boost members' posts.
Also, anyone can mention FediGroups without posting to them by adding ! before the group address.
ICYMI, Guppe groups are gone due to domain name problems (https://social.growyourown.services/@FediTips/115164282623836102) 
There is a new group provider FediGroups, here are groups in their public directory so far (! at start to avoid spamming them):
!@3goodthings
!@animeblogging
!@autistics
!@bookstodon
!@fedibiker (in German)
!@genealogy
!@kdrama
!@kpop
!@mtb (in German)
!@muzykametalowa (in Polish)
!@photography
!@pilipinas
!@pinoy
!@plantbased
!@podcasts
!@puzzling
!@thearkchat
!@xmpp
More info at https://about.fedigroups.social/home