In my opinion, the fastest way to try and fix the camera shutter is by starting with an implement reset. This should be able to work the camera shutter. If not, try and reset your device by holding the home button with the sleep/wake button for about 10 seconds. Contact Apple or an expert if both the solutions do not work.
Mine had the same problem. After looking into ways to fix it I checked with my service provider (AT&T) where I had the option of replacing it free or upgrading to a 4s for $200. My 4s has been amazing.