'program displays blank screen when using cv2 in Python

My program is displaying a blank screen when I run it. How can I fix it?

import cv2
import mediapipe
import time

cap = cv2.VideoCapture(1)

while True:
    success, img = cap.read()


    cv2.imshow("Image", img)
    cv2.waitKey(1)

python cv2

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'program displays blank screen when using cv2 in Python

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