Hi,
By default we support capturing frame data through v4l2 interface. Please check if you can follow the steps in Jetson Nano FAQ and run gstreamer command to launch the camera and see video preview:
Q: I have a USB camera. How can I launch it on Jetson Nano?
If yes, you can try this config file:
/opt/nvidia/deepstream/deepstream-6.0/samples/configs/deepstream-app/source1_usb_dec_infer_resnet_int8.txt