Hi,
The default version is
nvidia@nvidia-desktop:~$ gst-inspect-1.0 --version
gst-inspect-1.0 version 1.14.5
GStreamer 1.14.5
You may not need to manually install 1.14.2. For installing rtsp server, please run
sudo apt-get install libgstrtspserver-1.0
You can refer to
Jetson Nano FAQ
Q: Is there any example of running RTSP streaming?