When a specific picture is detected, a portal which can see through the scene in another world will appear, and the perspective can change with the player's position and rotation.
Cancelled left and right rotation because the nature of human eyes.
Needed AR foundation, AR Subsystems, ARCore XR Plugin, ARKit Face Tracking, ARKit XR Plugin from Package Manager, all preview.1 - 3.0.0 version.
Unity Version: Unity 2019.2.3