Unable to display video from Youtube with Python and OpenCV

Question

I am trying to get video from Youtube using Python 3.5, OpenCV 3.4.3 and Pafy 0.5.4. The problem is that cv2.VideoCapture(video_from_url) does not see the video from url. I also have seen this topic previously. Here is the code that works well if video_from_url variable is replaced with a path to video on my local PC.

import pafy
import cv2

url = 'https://www.youtube.com/watch?v=iCSd0slqzcQ&start_radio=1&list=RDiCSd0slqzcQ'

video_pafy = pafy.new(url)

video_from_url = video_pafy.getbest().url

cap = cv2.VideoCapture(video_from_url)

while True:

  ret, frame = cap.read()
  print(ret) # False

  """
  Further video processing
  """