Video over Tor is surprisingly usable in my experience. Captchas are a much bigger problem.

Services that ask for captcha solving when on tor are probably hosted / delivered via cloudflare. Not an option for a hidden service.

That's definitely not true. Most hidden service use some darknet-specific captchas nowadays. Just open the next best darknet market or simply forum and you'll see what I mean.

I use tor for some of my normal clearnet browsing and static hosting .mp4's works decently over tor. Basically anything not bloated/modern works great.