So you are looking for a smart 4k camera that you can mount to your FPV drone? The RunCam Thumb Pro 4K has you covered. It has built-in gyro for smoother video. It can shoot horizontally and vertically. It weighs only 16g and has a compact design, so you can use it with all kinds of FPV drones and RC toys. You can change saturation, exposure, and resolution through the RunCam app.
The RunCam Thumb Pro has a 155-degree field of view. It has 4k@30fps / 2.7@60fps resolution. It has a protective lens cover and replaceable ND filter. This camera supports SD Micro SD cards up to 256GB. It works with a 5V power supply.[where to get it]