I got some eachine vr007 pro goggles. I opened them once and noticed that they have 2 places where you can solder coax cables and also an extra hole in the casing
Fpvtips | How to add DVR to Eachine VR 007 Pro fpv goggles
Eachine VR-007 Goggles for Drone Racing FPV (first person view) | eBay