Hi! I recently came across gpu-screen-recorder when I was looking for something Nvidia ShadowPlay-esque for Linux and tried it out.
It worked great but the issue was that I had to manually both run the screen recorder and bind the keys I wanted for controlling the screen recorder before I launched the game, every time. And this resulted in me forgetting to do so most of the time... so I created this little helper script to make the process easier! :)
This script was made to work on X so if you're on wayland, please read the last section in the README :)