You can absolutely do image-based tracking with ARCore, but Id caution against using QR codes. I cant remember specifically how to do it, but theres a tool that gives an image a score based on how easily it can be tracked by the software and QR codes score pretty low. Id recommend instead high-detail landscape images or a non-repeating, asymmetrical design. Here’s one of mine that works well for image-tracking: https://i.imgur.com/jprNI3k.png
