Join Date:Joined: Aug 2012
The easiest way would be to get a camera app from playstore.....there are some good ones out there and they can pretty much mimic the 'stock' camera.
Another option would be to extract the camera app from a downloaded firmware, push it into system>>app and set permissions.
Final option would be to reflash the entire firmware to your phone.....
Sent from my GT-I9100 using xda app-developers app