You can do passthru with videos on SLR and AVP at least until Apple fixes the “hack.”
While watching a video with Passthru, turn your head/gaze as far left or right as you can, like you are looking off the screen. Then press and hold the crown and left button down at same time to bring up the Force Quit menu. You want to be sure you place the force quit box out of the way so it doesn’t obscure your view.
Now, turn on the passthru button on the SLR video control. Voila….unbelievably sharp passthru on the AVP at full resolution.
This is obviously not working as intended, but gives you ua good feel for what’s possible if Apple ever allows Dev control over the Passthru functionality.