This had been achieved already using the app
This has been achieved using the Litchi app and A decent set of mobile phone vr goggle. Look up Litchi VR inspire 1. Its now updated to offer head tracking on ios devices. Not sure if it offers master/slave independance though. I worry that the response time on turing the gimbal will have a delay even with gimbal speeds way up. This leaves the vr experience realistically to "passengers" using the slave remote to send them on a ride, while you fly line of sight and with the map indicators. The camera will be free and turning all over while the persons looks around. The pilot could even override the camera with finger swipes to show the viewer an attraction if they cant find it alone. what would be really cool, is if the slave could use the litchi app, and the master could stay on DJI Go for realiability. Litchi devs you out there?