Another developer has discovered a simpler method to access the Quest 3's cameras. - UploadVR
Another Developer Found An Easier Way To Access Quest 3's Cameras
A developer has discovered a way to access the Quest 3's passthrough cameras more easily. While Meta doesn't officially allow third-party access to these cameras, VR developers like Michael Gschwandtner and Julian Triveri have figured out workarounds. Gschwandtner used Quest's casting capability, but Triveri found an alternative method using the Android media projection API, which avoids the need for casting or logging in. This technique requires user permission and has certain limitations, but it effectively provides full access to what the user sees. For a complete explanation and a demo, visit UploadVR.
Source: https://www.uploadvr.com/quest-3-raw-camera-access-better-workaround/