Just posted: Image Detection in iOS 8 on the Xamarin Blog.
Read the full article to learn how to use new Core Image detectors in iOS 8.
Use this thread to discuss or ask questions.
I can't get it work on Xamarin iOS 8.6, it doesn't return any features from FeaturesInImage method. I've tried both with rectangle and face recognition.
Is it simulator not capable ? Did you managed it to work with simulator ? (iOS Simulator 8.1 12B411)