With more details on Apple Vision Pro being available during WWDC23, developers found out that in current release of visionOS access to outward facing cameras will not be provided to third-party applications.
The only access apps could get is simulated camera with user's Digital Persona (and only if user approves access). This camera will act like front facing camera on iPhone allowing recoding of user's face reconstructed using ML model.
In order to build immersive AR experiences developers have to rely on ARKit entities and scene understanding capabilities.
Reference: Vision Pro keeping camera access under lock and key compared to iPhone and iPad