You'll need the following to use (PS4 Remote Play).
Computer*
PS4 system
PS4 wireless controller
USB cable
High-speed Internet connection at least 15 Mbps.
The next thing you will need is a capture software we recommend Streamlabs OBS but you can also just use OBS (Open Broadcast Software), then once you download your chosen software you'll need to add a scene then you will need to add a source in the box beside scenes.(example below)
Once you have added a scene you will need to add a source and add a source called "Window Capture" by doing this you will be capturing the window called "PS4 remote play" and then your set!
Once in a while you may need to go into the window capture and recapture it by clicking a different window and then clicking PS4 remote play again.