I have a 3" Armattan Japalura that's really fun to fly.  I set the camera angle very low, which makes it possible (just barely) for me to manage flying it around my yard.  I have always wished I could capture some video with better quality than what I get in the goggles.  A few days ago I bought an Insta360 Go camera and mounted it on the quad:



The camera along with the mount adds 40 grams to the total weight.  I can definitely notice the added weight when flying, but the quad still performs OK.  The video quality is great, and the excellent stabilization makes my flying look a lot smoother than it really is.  Here's a flight I made with the camera pointing toward the rear of the quad:



The video quality was much better before YouTube mangled it, but we all know about that.  Here's a more conventional flight with the camera facing forward:



If you're looking for good HD video from a small craft like the Japalura, this seems like a good solution.