App Run Fails With Errors

Modify the following configruation item as your device.

[source0]
enable=1
#Type - 1=CameraV4L2 2=URI 3=MultiURI
type=1
camera-width=640
camera-height=480
camera-fps-n=30
camera-fps-d=1
camera-v4l2-dev-node=0

More information about v4l2, you can refer this FAQ

Noticed that you are using a jetson nano. This device has a small memory.You can refer
source1_usb_dec_infer_resnet_int8.txt in /opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app