hello JiaZW,
how about running with below?
$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=300 ! 'video/x-raw, width=1920, height=1080, framerate=30/1, format=UYVY' ! nvvidconv ! fpsdisplaysink text-overlay=0 name=sink_0 video-sink=fakesink sync=0 -v