There used to be one called Subgraph, but the project is dead, I think. Hope someone will pick it back up, because there’s certainly people who’d prefer to sacrifice the security benefits for performance, while keeping the isolation/networking parts of it.
Qubes, for their part, is pretty clear this won’t happen, but that seems pretty reasonable given their project goals.
I don’t know about a guide, but I believe it’s still possible to rip 4K HDR using an HDCP downconverter . HDR/DV data is included over HDMI, the problem is that it’s all encrypted (along with the 4k stream itself) with HDCP 2 which isn’t publicly broken yet. This box (and others like HDfury) does some tricks to force a fall back to HDCP 1, which has been broken for a long time, so you should then just need a capture card that supports it.
Scene releases may have better/faster techniques depending on the streaming platform, but they probably wouldn’t talk about them if they did.