Using an PerspectiveCamera in RealityKit

It looks like for nonAR configurations, it is possible to add a PerspectiveCamera to a RealityKit scene; is there is a way to do kind of a picture-in-picture layout with a live camera feed showing one perspective and using a PerspectiveCamera to somehow simultaneously show a second angle on the same virtual content? Short of that, is it feasible to record my AR data and play it back in a nonAR configuration using the PerspectiveCamera?