Hi,
Not sure if http link works in cv2.VideoCapture(). This would need other users to share experience.
We suggest try RTSP in gst-launch-1.0 command like:
$ gst-launch-1.0 uridecodebin uri=rtsp://_URI_OF_THE_SOURCE_ ! nvoverlaysink
If above command works, please apply the URI to this python sample and give it a try:
Doesn't work nvv4l2decoder for decoding RTSP in gstreamer + opencv - #3 by DaneLLL