Pixelation and blocky artifacts in video

[UltraBorg]

I have setup hardware acceleration for encoding and decoding using Intel QSV. I've verified it is working properly. As for what I am trying to achieve, I just don't like seeing those blocks of colors that you can see on the first image (Try turning up your brightness and contrast maybe?). It may not look bad on screenshot but it is extremely distracting when watching the stream. Hoping there is some way to get rid of it