Augmented Reality for Developers

No video feed on the iOS device

If the Unity app loads but the screen is blank, that could be due to a number of causes. Double-check to see that you've granted permissions to use the camera by filling in Camera Usage Description.

With ARToolkit, users have also reported that you should enable Allow non-RGB video internally in the AR Controller component (and try disabling Use native GL texturing):

For other errors, Google is your friend.