That is parallelized... I didn't make mention of threading being the concern here.

The 100+ billion operations per second isn't exactly easy.

4k 60fps = 498 million pixels per second

Each pixel takes a couple hundred logical operations with HEVC.

A modern high end 4GHz, 8 physical core CPU at 4 instructions per cycle, at maximum capacity, can handle 128 billion operations per second.

You probably wouldn't even get your realtime framerate in this scenario.