Hi,
ssh X forwarding is not supported. Please try the command without -X:
ssh Nano@NanoIP
If it still fails to run, please try the gstreamer command to make sure the camera source is valid:
gst-launch-1.0 nvarguscamerasrc sensor-id=0 ! video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, framerate=30/1, format=(string)NV12 ! nvvidconv flip-method=2 ! video/x-raw(memory:NVMM) ! fakesink