How to make sure hardware acceleration is used by PyAV?

[Fostereee]

I am working with ffmpeg and hardware acceleration. Using ffmpeg in cli with option hwaccel or c:v can force hardware decoding.
However in PyAV, if I pass the same hwaccel or c:v parameters, such as
av.open(path, options={"hwaccel":"cuda"} ) or av.open(path, options={"c:v":"h264_cuvid"}
it does not seem to use the GPU though I am not completely sure (one cpu reaching 100% in htop).
It also does not throw any exception even if I set hwaccel to gibberish.

Is there a way to force PyAV to use hardware acceleration or at least force it to throw exception when it does not support it?
My pyav version is 10.0.0.

Thanks.

[seatv]

You can use nvidia-smi (run this from a command prompt non Windows) to see if the NVIDIA GPU is being utilized.