I'm trying to develop a 2D game where when the player holds up objects to the device webcam, the sprites animate. It seems that Vuforia's object detection is the best for setting this up, but I don't need to take advantage of the AR aspects of Vuforia. Just the object detection, which will then render sprite actions on a 2D game background, with no webcam feedback visible.
I've tried setting up a 2D camera on top of the Vuforia 3D camera, but this doesn't work. How would I go about doing this? Can I somehow get the Vuforia camera to sit 'behind' a 2D game?