'https://stackoverflow.com/questions/12674917/iphone-5s-low-light-boost-mode
If ([[self backFacingCamera] respondsToSelector:@selector(isLowLightBoostSupported)]) {
If ([[self backFacingCamera] lockForConfiguration:nil]) {
If ([self backFacingCamera].isLowLightBoostSupported)
[self backFacingCamera].automaticallyEnablesLowLightBoostWhenAvailable = YES;
[[self backFacingCamera] unlockForConfiguration];
}
}