I would first do a hard reset of the phone. Hold down the power button and home button at the same time until you see the Apple logo. It could take up to 10 seconds for the logo to appear. Let the phone reboot and then check your camera.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.