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libvlc_video_set_output_callbacks does not seem to work with vdpau, it falls back to: Without libvlc_video_set_output_callbacks vdpau is used: It would be nice to use libvlc_video_set_output_callbacks with vdpau, so it would be possible to use it with nvidia GPUs (with Windows and DXVA2 it already works).
Or is it intended that libvlc_video_set_output_callbacks only works with vaapi?

Edit: With Windows it is:

To use VDPAU, you need to supply an X11 window handle, not output callbacks.

I see, thanks. But isn`t the purpose of libvlc_video_set_output_callbacks that the image stays on the GPU? And right now Linux uses GPU too, just not the nvidia one.
Or is there another way to use nvidia cards with libvlc video callbacks and Linux?

No. Patches are welcome.