Every single headset in the world that has cameras. The HoloLens, anything that uses OpenXR and OpenVR (so, pretty much 100% of the current PCVR market), hell even the Quest has a Passthrough API.
The Vision Pro is pretty much the only one that doesn't, because Apple thinks of their users as children.
A passthrough API, but you absolutely do not get access to the headset cameras on any of those devices. Apple is very much in line with the standard here, you can make passthrough apps, but you cannot actually get the real data from the cameras.
Is there any headset that does allow this currently? Doesnt seem like any kind of differentiating factor