Thank you for the great post!
It helped a lot to me and hw acceleration now works on my GPU also:
Intel® UHD Graphics 620 (verified on two different Intel CPUs)
Also, just to mention that for me I had to use the following arguments, maybe it helps to someone else also:
chromium --enable-features=VaapiVideoDecodeLinuxGL --disable-features=UseChromeOSDirectVideoDecoder --ignore-gpu-blacklist --enable-zero-copy
Question: do you maybe know when this change will land in the stable Chromium branch?
Thanks!