The training should work on Nano 2GB for things like the DLI course, JetBot, and Hello AI World.
Can you try the suggestions from this post? https://forums.developer.nvidia.com/t/camera-freezes-in-image-classification/158686/9
Also, if you are using MIPI CSI camera, you may want to switch to using USB webcam for the DLI course, like Logitech C920/C270 or similar.