All of the stuff below is moot until you have a model that you can fly well to begin with. But since you;d need ot have the right kind of model to carry the camera gear, you would want to take that into account (3 ounce camera on C6 powered model = NO!)
I’m currently using the Eachine TX03 camera with built-in TX. It is very small and weighs about 6 grams. A separate 3.7V Battery is about 3 grams. Banggood.com has it for about $27 at their US store, $19 at their main store in China.
https://tinyurl.com/jh7h9ph
Here is just how small that is, next to an 18mm engine.
The goggles I’m using are the Eachine VR D2. Pretty much a modern smartphone type screen a few inches away, rather than the small types like Fatshark which cost many times more. This one has a DVR to record the flying, and two different types of antennas, the "mushroom" or spiral type is omnidirectional, while the flat "patch" antenna has a narrow reception field of view but works at better range (so you try to point the goggles at the model if the omni starts to lose it, while also turning the model BACK!). The electronics of the goggles chooses moment by moment whichever has the best signal (diversity).
https://tinyurl.com/zb72cxl
There are certainly better cameras, and better goggles. But for small models, it’s not practical to lug around a bigger heavier camera, with a separate video transmitter. Mainly a better camera if you wanted better image quality for a recording to play back, as opposed to just FPV flying.
Now indeed I do have a better camera and separate Tx, but that’s for a bigger model later (Quadcopter). And ultimately for that Tx I plan tp plug it into a GoPro so for FPV flying I can see where to aim the camera, then after landing get the high quality GoPro video file for it. But that would be pretty heavy for most R/C RBG’s. I’m mainly planning that for Quadcopter flying, MAYBE on a big electric plane like Radian.
OK, so some past onboard video stuff I did. In the early 2000’s, there was the “Gearcam”, an onboard 2.4g video camera transmitting video to the ground. I never tried FPV, it was just for recording onboard video (a few years later, the 808 type “keychain” cameras came along, making live video obsolete since the camera was ampler, lighter, easier to use, and required none of the ground equipment (to record the video on the ground, in those days, I had to use a real VCR powered by a voltage inverter off a car battery!). Also, sometimes the video signal cut out, even when not nearly as far away as the range should have been.
Anyway, a link to a page that has info on the modified “Cuda” R/C RBG that I added a rotating camera pod to. For launch the camera was pointed at the tail. Then after transition to glide, I flipped a switch for a servo to unlock it to allow a rubber band to rotate it 180 degrees to face forward.
https://georgesrockets.com/GRP/AOL/GCGassaway/video/Video_March_05.htm
And here is one of the best videos of a boost. Note there are some tiny elevator (V-tail) corrections on boost, but the model was very well trimmed out by that flight so it did no need much correction.
[video=youtube;byNWmHn8Pq0]https://www.youtube.com/watch?v=byNWmHn8Pq0[/video]
Here is a much shorter one using two staged C6’s. The camera only looked at the tail. Good way of seeing how a mixer with and inverted v-tail works out for flight control.
[video=youtube;DfW8R83s0wM]https://www.youtube.com/watch?v=DfW8R83s0wM[/video]
Also, for the heck of it, video from doing some practice landings for the FAI S8E-P event. I practiced by using a short Hi-Start to pull it into the air. The model had a big flap that I activated shortly before landing (can see it deployed in the ground shadow after the first landing, at 1:51. At 1:57, it is retracted and you hear the servo when it retracted). And the onboard camera was an 808 Keychain type camera, just to document the flying for review later. The way these models have to be maneuvered around to try to land on a spot at an exact time, it would not be very practical to use FPV (note the landing spot is often not visible until the last moment, while for FPV landings you need a good view of the intended spot long in advance and make a long mostly straight approach).
[video=youtube;TdB_ZezOZlA]https://www.youtube.com/watch?v=TdB_ZezOZlA[/video]