I use a Contour Roam, it films wide angle 170 degree at 720HD, and is perfect for paintball, and cheap enough that you don't have to worry about it. If you are patient, you can get one for $100 or less. I put mine between my eyes, right on my visor with the furnished tape mount. (and use a zip tie or duct tape to keep it from "bouncing" when running).
Action cams are really fun, as they show you what you missed when you were playing. You will go back and be like, whoa, I didn't even see that guy over there getting in position and taking me out! But, you really can't see much with them unless the target is backlit or close to you.
You can build a ZoomCam setup like mine for $225 with the camera. That is the only way to truely "see" what you are shooting at paintball distances.