Comment by coldsmoke

We've experimented with that at SVT (Sweden's public service broadcaster). Or rather, the video team has, I'm just a web dev, so I don't know the details other than what's in this blog post:

From the eyes of the viewer: Attention-aware video compression for improved low bitrate video https://medium.com/the-svt-tech-blog/from-the-eyes-of-the-vi...