ios - Detect when user denies access to camera -

note: questions not duplicate of questions asking how detect if user has denied access.

i saw lot of code on how detect if user has given access camera, i'd need know when user denies access.

my scenario next:

user opens view a, asks access camera, pop appears, user denies access, user redirected b.

is possible?

actually, there's way of doing it:

 [avcapturedevice requestaccessformediatype:avmediatypevideo completionhandler:^(bool granted) {         if(granted){             nslog(@"granted access");         } else {             nslog(@"not granted access");         }     }];