'cant open camera in ubuntu 20.04

import cv2

video_capture = cv2.VideoCapture(0)
#video_capture = cv2.VideoCapture('video/ros.mp4')

while(True):
    retVal, frame = video_capture.read()
    
    #frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    #frame = cv2.resize(frame, (0,0), fx=0.5,fy=0.5)
    #cv2.line(frame,(0,0),(511,511),(255,0,0),5)
    cv2.imshow("Frame",frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

video_capture.release()
cv2.destroyAllWindows()

its my code in ubuntu 20.04 but cant open the camera the result is result

pythonopencvubunturos


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