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 up green indicating the Share overlay has been turned on.
In Settings, click on Recordings:
Set the path where the video’s will be recorded. For example c:\pinball\pinballx\GeforceCapture
Hit the Back button and hit Done
Check under Records what the key is to start a record. By default it is Alt+F9
Close the Share Overlay
Open PinballX Setup Wizard and select Video recording in the left pane
Select Use GPU driver capture to Yes
Make Sure that the Driver record start/stop key are the same as the hotkey that is defined in the Geforce Experience Share overlay screen
Set the Driver save path to the same directory as the Recording path in the Geforce Experience Share overlay screen
Save your settings !