Update: Using an UnlitMaterial node instead of PreviewContent, with tone mapping disabled, gives a much more vivid render. See @Shengjiang's answer below.
halm
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You will get a better response if you start a new thread
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This sample code looks like it will help you. I think it’s quite new.
https://developer.apple.com/documentation/avfoundation/media_reading_and_writing/converting_side-by-side_3d_video_to_multiview_hevc