No such element or plugin 'nvv4l2decoder'

Hi. I am having the same issue. I am using Jetson Xavier NX with Jetpack 5.1.1 (rev 1) + DeepStream. Running the following command:
gst-launch-1.0 rtspsrc location='rtsp://192.168.1.10:554/user=admin_password=tlJwpbo6_channel=1_stream=0.sdp' protocols=tcp latency=100 ! rtph265depay ! h265parse ! nvv4l2decoder ! nvvidconv ! video/x-raw, width=640, height=480, format=BGRx ! videoconvert ! video/x-raw, format=BGR ! appsink drop=1
results in
no element "nvv4l2decoder"
I installed the gstreamer plugins:
sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-bad1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio
and
sudo apt install --reinstall nvidia-l4t-gstreamer
and it just does not work. Do you have any suggestions on how to install the missing “nvv4l2decoder” plugin?