[Libva] Opengl surface to VaSurface

[Sergey Omelchenko]

Is it possible to send opengl pre-rendered surface to VaSurface for
encoding without CPU and system memory usage (it`s very slow)?

Planned scheme: h.264 stream ->vaapi decoder -> VaSurface -> OpenGl Surface
-> Opengl postprocessing -> VaSurface -> vaapi encoder -> h.264 stream.
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