Hi,
On Jetpack 4.5.1(r32.5.1), we are able to run RTSP server on Jetson Nano + AverMedia CAM513. Please refer to the commands:
$ sudo jetson_clocks
$ ./test-launch "v4l2src device=/dev/video1 ! video/x-raw,width=1920,height=1080,framerate=30/1,format=UYVY ! nvvidconv ! video/x-raw(memory:NVMM),format=NV12 ! nvv4l2h264enc ! h264parse ! rtph264pay name=pay0 pt=96"