There is code in `AppController.mm` that handles the movie viewer, search for `video view controller`. It's possible that changing some of the logic there for handling the orientation of the `UnityVideoViewController` will achieve what you want. Alternatively, rotate the video before you render it out, so the video is portrait and not landscape. When you play a portrait video back in a portrait game, it'll look landscape, if you get what I mean.
(Have you checked that playing back landscape video when the game is portrait is acceptable to Apple?)
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