To fix the OBS black screen game capture with NVIDIA open the control panel and follow these instructions.
- Select 'Manage 3D Settings'
- Click on 'Program Settings' tab
- Pull up OBS in the program list. If it's not there, add it to the list
- Open the application folder and select OBS64 or OBS32
- Tick 'show only programs'
- Select 'High Performance NVIDIA processor
- found on https://filmora.wondershare.com/screen-recorder/how-to-resolve-obs-black-screen.html
- but i would further like to add if the above solution does not work
- Set Max frame rate to 1000FPS