Capture Video from Camera using cv2.VideoCapture(0) not working

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Hi,

I am trying to execute the following code regarding video capture from webcam on my laptop. I am using Python3 with OpenCV4 on windows 7.

import numpy as np

import cv2

cap =cv2.VideoCapture(0) 

while(True):

ret, frame = cap.read()

gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

cv2.imshow('frame',gray)

if cv2.waitKey(1) & 0xFF == ord('q'): 

break

cap.release() 

cv2.destroyAllWindows()

While executing the code the camera opens but the camera display windows shows a still blurred multiple gray image instead of the live video. I am using IDLE python IDE for execution of the code. It says some VideoCodec_RGB24 error. For crosscheck whether I have installed the python and OpenCV properly or not, I used a code that reads mp4 file using the command.. cap = cv2.VideoCapture('video1.mp4'). The program is able to read from the mp4 file and it displays the videos too. Please advise to fix the problem.