H264 decoder for RTSP stream inside the docker

Hi,
It looks like you manually build OpenCV package. The default version should be 4.1.1 but the log shows 4.4.0.

Please check if you can apply the RTSP URI to this sample and run:
Doesn't work nvv4l2decoder for decoding RTSP in gstreamer + opencv - #3 by DaneLLL

If you cannot successfully run this sample, we would suggest re-flash the system and try default 4.1.1.