title_body: 2D/3D/fpv video glasses to use with external camera
upvoted_answer: Ordinary FPV cameras output an analogue PAL or NTSC TV signal, which you should be able to plug straight into a TV or goggles that are intended for watching TV.
  Some FPV goggles only have a receiver and no input socket, but the good ones generally allow you to change the receiver, and thus have a socket for the AV signal. (Also some of the very cheap ones are just a box for a screen from an automotive reversing camera system, and expect you to provide your own receiver)
  So, skipping the radio link should be easy enough, which is good because you do get some radio 'noise', especially if you're indoors where the signal can reflect from metal objects, or where there's interference from WiFi and other electronics.
  Good quality FPV cameras are generally optimised for a wide dynamic range (so you can still see details on the ground when the sun is in the picture) and low light (it's common to finish an evening flight and be surprised by how dark it really is) and low latency (for racing) but the resolution is usually fairly limited because the radio bandwidth is limited.
  It gets harder if you want better resolution. The only real option from the FPV world is the DJI digital FPV system, but it's quite expensive and I don't think you can use it without the radio, which is integrated into the goggles. The goggles may have an HDMI socket, but the camera doesn't.
  Then again, there must be HDMI cameras outside of the FPV world. A quick google shows lots of people using DSLRs, and lots of action-cams (like GoPros) have HDMI ports - although I'm not sure if they support real-time video, or just replay. Also, any form of digital processing introduces some lag, and it doesn't take much to make hand-eye coordination difficult.