You can use your Geforce Experience driver to capture video's within PBX. This will only work for playfield captures and not for backglasses
This manual will show you how to set it up
Open your Geforce experience
Press Alt+Z to bring up the Share overlay and go to Settings :
NOTE: If the Share overlay does not appear it may be turned off. You can turn it on inside GeForce Experience by going to Settings > GENERAL > SHARE and toggling the switch. It will light u