read video opencv python

                                    import cv2
frameWidth = 640
frameHeight = 480
cap = cv2.VideoCapture("Resources/test_ video.mp4")
while True:
    success, img = cap.read()
    img = cv2.resize(img, (frameWidth, frameHeight))
    cv2.imshow("Result", img)
    if cv2.waitKey(1) and 0xFF == ord('q'):
         break

                                    import cv2
filename_video = "path_to_your_video"

input_video = cv2.VideoCapture(filename_video)
if input_video.isOpened() == False:
  print("Video not found")
  sys.exit(1)
else:
  # Read until the video is completed
  while(input_video.isOpened()):
    # Capture frame by frame
    ret, frame = input_video.read()
    if ret == True:
      frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
      cv2.imshow('frame',frame)
    else:
      break
	
  input_video.release()
  cv2.destroyAllWindows()

                                    import cv2
cap = cv2.VideoCapture()
# The device number might be 0 or 1 depending on the device and the webcam
cap.open(0, cv2.CAP_DSHOW)
while(True):
    ret, frame = cap.read()
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()