I also can not use hardware video rendering yet. But I have the
opportunity to use CUDA, it can be seen on the example of the Blender:
GG also asks what you see in the window from where you start Cin with CIN_HW_DEV=vdpau. Send that. And for the graphics board, that will be in the /var/log/Xorg.0.log which you can send to me privately if you want. gg/Phyllis