The interop may modify its own copy of the video_format_t.

These changes must be reported to the core (by writing to the provided
video_format_t), except for the orientation: it is managed internally by
OpenGL, so from the core point of view, the orientation does not change.

Handle the format to report to the core outside of the renderer. This
paves the way to pass only the interop to the renderer, without an
additional video_format_t instance.