gistfile1.m

// Camera permission handling - iOS 8
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted){
    if (granted)
    {
        dispatch_sync(dispatch_get_main_queue(), ^{
            // Present camera controller here
        });
    }
    else
    {
        dispatch_sync(dispatch_get_main_queue(), ^{
            // Handle denied permission here (error message, UI update, etc.)
        });
    }
}];