Read rst gstreamer with nvidia acceleration

Gaming and Visualization Technologies Video Processing & Optical Flow
1

i try to use gstreamer to read rstp without latency as below:

import cv2


url = "rtsp://admin:abcd1234@192.168.1.104:554/Streaming/Channels/101?transportmode=mcast&profile=Profile_1"
pipeline = 'rtspsrc location=%s latency=0 ! decodebin ! ' % url

cvt_pipeline = (
                'videoscale ! '
                'video/x-raw, width=(int)%d, height=(int)%d !'
                'videoconvert ! appsink sync=false'
                % (1920, 1080)
                )
cap = cv2.VideoCapture(pipeline + cvt_pipeline, cv2.CAP_GSTREAMER)

while True:
      ret,frame = cap.read()
      if not ret:
        print('empty frame')
        continue

it is work, but it use cpu too much.
i find out that, i can use gstreamer with nvcodec. (Install NVDEC and NVENC as GStreamer plugins · GitHub)
but don’t know how to implement it. Could you guide me to do it?