As much as people love the DJI Mavic Pro, it's not easy to setup a way to fly FPV. Of course DJI has just announced a new set of Goggles, but if you think the those are too big and bulky to fly FPV with your DJI Mavic Pro, the Epson Moverio (seen here) might be a good option. It doesn't quite have all the features of the DJI Goggles, but the Epson Moverio is lightweight and legal to use as a pilot because you can still maintain line of site with your craft. You can get more info about the Epson Moverio BT-300FPV Glasses (here).
Epson Moverio BT300FPV Glasses DJI Mavic Pro Inspire Phantom