I would like to know this too. I think it is in  PhotogrammetrySession.Request.modelFile(url:detail:geometry:)  and in Geometry, we can pass a bounding box and transform. I just haven't figured out how to do that properly. Apple, please help!! thanks, Dale

I think you mean animation playback instead of video playback. It is 3D animation and you get video style controls. I "WISH" we could have video playback in AR quicklook. I could make good use of that.

were you ever able to get it to build? I am having the same problem