Nowadays action camera is a very popular choice. You can record a video under water, from another perspective or to use your action cam in extreme sport situations and capture what you normally can´t see.
If you are looking for one, here are the top action cameras that are currently on the market
Both these action cameras are waterproof without case and are able to shoot wide angle 4K slow motion.
Moreover DJI Osmo action cam has also a front screen so you can actually see yourself when recording.