Roon plugin for YouTube video

Idea is to keep lossless music playing from Roon and plugin would locate matching video from YouTube and play official music video from Apple TV for example and match timing of video and Music from Roon …

Virtually impossible IMO.
Lots of music videos have a leading sequence / plot / story before the music begins when the official track doesn’t.
Then there’s extended versions, cover versions, alternate versions, demos etc.
Why not just play the tidal app on the apple TV and feed the audio out to your amp or whatever?
Or apple music if it has videos?
I’m not an apple user.

Matching sound with video would be a challenge I agree , I’ve done what you are suggesting but Tidal has limited video collection and I don’t think that audio content is in lossless format for videos…

Definitely a challenge, when you are looking for Roon to locate the correct corresponding video and music files and control the sync between multiple third party apps.

Tidal video turns out to be pretty good ,
Goddamn Rihanna videos. Oh my God…