How to Fix 'Camera Busy' Error Android?
More info on Camera Busy Error and also the process to Hard Reset Your Smartphone.
https://goo.gl/25mVH5
Here are few solutions to fix the issue of Camera Busy, unable to start error on your Android smartphone. This issue is common with all Motorola Moto devices like X, E, G3, G, G2, Z etc and also with some other manufacturer smartphones.