It is possible to use AirServer for Mac as a source in OBS (Open Broadcaster System). By setting this up, you will be able to use your device's mirrored image in OBS.

You can add AirServer for Mac as a source by following these steps:

  1. Make sure to start mirroring first.
  2. Press the add a source button and choose Syphon Client. 
  3. Press Create New, give it a name (eg. AirServer) and press OK.
  4. Select your device from the Source dropdown menu and press OK.