This sample is based on this tutorial which shows the usage of CIDetector
class, pretty straight forward :)
The aim of this sample is to show the right way to convert coordinates (CoreImage โ UIKit) which is not a big deal but the former example does it incorrectly and it seems to have gained some popularity already.
This my (another) one cent to the dev community โฆ blah blah blah.
Hope it helps.