How to Get CameraToWorldMatrix and ProjectiondMatrix in video mode

i have a question.
In the “Locatable Camera” document,it said "Each image frame (whether photo or video) includes a coordinate system, as well as two important transforms."
But i can only get the two transforms of image frame by use photocaptureframe.TryGetCameraToWorldMatrix and photocaptureframe.TryGetProjectionMatrix in photo mode,and how can i get the two transforms(CameraToWorld and Projection) of every video frame in video mode?
Sorry for my poor english.

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