I was trying to screen record using gpu-screen-recorder and gpu-screen-recorder-gtk. But, using the tools as-is seems to use the CPU, not gpu. I used:
gpu-screen-recorder -w screen -f 60 -a "$(pactl get-default-sink).monitor" -o video.mkv
I tried doing prime-run but that resulted in black screen recording with only audio, this however worked in x11.
I also tried to apply the NvFBC patch for Nvidia drivers, with no luck.
Specs: https://0x0.st/HYfn.txt
Thanks for helping!