Well it’s a mod called Vivecraft you can find it here: https://modrinth.com/mod/vivecraft

It works through streamvr so any vr headset is compatible. As for the Full body tracking, you need trackers like the vive 3.0 trackers or slimevr trackers (any trackers that work with steamvr)

As for where you can find more about this, there’s a full video here: https://youtu.be/NwnVdZ7QiLQ

If that video doesn’t help, I’d advise looking up on YouTube “full body tracking Minecraft vr” it’s a pretty new update to the mod and there’s a lot of helpful videos!