I am facing the same issue. The CAM unit is greyed out in UIFlow for Core2.
How to get the live video of Unitcam on Core2?
Also the CAM2CORE sketch (https://github.com/m5stack/M5-ProductExampleCodes/blob/master/Unit/UNIT_CAM/CAM2CORE/CAM2CORE.ino) does not work for Core2. If this sketch is uploaded to Core2, the Core2 does not boot any more.
Any help on this is greatly appreciated. Thanks