Gopro owners can get a Gopro Roll Bar Mount for their cameras.  The mount is easy to install and attaches to any tubing or framing that is 1.4″ to 2.5″ thick.  Its perfect for Go Karts!  Its actually a pretty versatile mount.  Some suggestions from gopro are for  bike frames, bumper bars, and  ski/surfboard racks.  The mount has an adjustable pivoting arm to allow for 3-way adjustability giving you the perfect shooting angle.  Its clamp and go.  If you can clamp it you can film it.  Hardware is stainless steel so no worry about rust when you get it wet.  If this mount does not fit your needs, check out the rest of the gopro mounts available.