ok i made an account to add to this topic
i also had this black screen issue brand new msi gaming laptop so this wont work on desktops the steps i used are as follows
this bit is a direct copy paste from the site
Nvidia's control panel -> 3D settings on the left -> Global tab on the right -> Click the drop-down box below that, select the nvidia -> Click Apply and OK -> Restart OBS and game.
what i would add is i had to alt tab out of the program i was trying to record, to obs then back to the game the footage then showed up and i was able to play and capture from the game capture, source option with the game properties application set to the game