public void RemoveObservers(AVCaptureSession session)
{
if (_addedObservers != true)
{
return;
}
NSNotificationCenter.DefaultCenter.RemoveObserver(this);
NSNotificationCenter.DefaultCenter.RemoveObserver(_wasInterruptedNotification);
NSNotificationCenter.DefaultCenter.RemoveObserver(_interruptionEndedNotification);
session.RemoveObserver(this, RunningObserverKeyPath, _sessionRunningObserveContext);
_addedObservers = false;
}