I am using a Macbook Air (Mid 2011), with Intel HD 3000 graphics.
I would love to be able to try and disable graphics acceleration to see if that would reenable Airplay mirroring, which has worked on High Sierra for me. How would I be able to, as you said, "choose between Airplay or Graphics Acceleration"?
Note that my iTunes purchases are unable to play with video in the TV app as well. Only audio and subtitles show up. I am however able to Airplay these videos to an Apple TV. I suspect that being able to disable graphics acceleration may enable video too, so your advice on how to do so is appreciated.