Solution 1: Fix the camera application
Opens the general settings of your Android (slide down the top bar on the screen and tap on the figure of a gear). Then, choose Applications Manager> All> House and there touches on the "Force Stop" button. It also touches on the "Clear Cache" button and "Clear data". Reboot your phone and check if the camera is fixed.
Solution 2: Reset the factory settings
Unlike the first four options, this solution will leave your device as new and will erase everything you've saved or set to it. Be careful to make a backup or backup of your phone. Done that, go to the settings of your Android, option "Backup and Restore" and there choose "Reset factory settings".