The point the parent poster was trying to make was that the GPU cores themselves are not a great match for video codec work.
However most consumer/server GPUs include hardware IP blocks specifically for doing codec work.
However most consumer/server GPUs include hardware IP blocks specifically for doing codec work.
The codecs that NVEnc supports are just a few bunch, there is no real-time audio, no nothing.
All of this is implemented in CUDA, using normal CUDA implementations of audio and video codecs, and running on normal GPUs using normal GPU cores. In real time. Supporting thousands of audio and video channels concurrently.
Also, even for NVEnc and NVDec themselves, in some of the GPUs they do not use any specialized hardware and use normal GPU cores instead (e.g. see the older GM20x GPUs).
I'm not sure they are for sale either (probably for the right price), since they sell these "as a service", which pays better. I also don't think these are on sale for "small" customers.