Hi,
Please apply the URL to this sample and see if it works:
Doesn't work nvv4l2decoder for decoding RTSP in gstreamer + opencv - #3 by DaneLLL
And you can run the pipeline with fakesink in gst-launch-1.0 command like:
$ gst-launch-1.0 rtspsrc location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov ! rtph264depay ! h264parse ! nvv4l2decoder ! nvvidconv ! 'video/x-raw, format=(string)BGRx' ! videoconvert ! video/x-raw,format=BGR ! fakesink
To ensure the pipeline is good.