Video decoding (encoding?) support

[dzhdanNV]

See:
VK: VK_KHR_video_decode_* and VK_KHR_video_encode_* plus VK_KHR_sampler_ycbcr_conversion
D3D12: https://learn.microsoft.com/en-us/windows/win32/medfound/direct3d-12-video-overview
D3D11: https://learn.microsoft.com/en-us/windows/win32/medfound/direct3d-11-video-apis