How can I track images with HoloLens 2 in Unreal? | One Dev Question

HoloLens 2 has built in QR code tracking, which you can access directly through Unreal's AR tracked geometry system. To track non-QR images, you'll need to grab images off the HoloLens camera and process them with a third-party image recognition library.  For more details, Summer Wu suggests visiting HoloLens Photo/Video Camera in Unreal - Mixed Reality | Microsoft Docs.