Examples of using WebXR to view a flat stereo video in VR?

Hi there, does anyone have an example of how to view a flat stereo video in VR with WebXR? I know we have a 180 / 360 degree stereo video here: three.js examples, but curious if there’s one somewhere for flat videos? Seems like it would need a PlaneGeometry instead of a SphereGeometry.

PS. By a flat stereo video, this is what I mean (example video):

Thank you!