A free app for Android, by theandroidseb.

This is a simple, helpful app that allows you to restart the camera on your Android device without needing to restart your phone. It is meant for people who encounter the error message “Can’t connect to the camera”. This error usually occurs when the phone is not properly connected to the Internet or the camera is not working. If you are having issues with your Android device and the camera, then you should try restarting the device. However, if you are still having problems, then you can use this app to try and fix the problem.

This app uses root permission to kill the process named “/system/bin/mediaserver” from the system user “media”.