The link you provided to your repl lead to a 404 page, are you sure you got the right link or is your repl set to private? You can see how to share your code in the post below:
I don’t think Replit supports cv2.imshow… (needs to be confirmed)
You can try use the file viewer to see the file manually. Or instead of displaying images with cv2.imshow, you save them using cv2.imwrite and then view them after that.
Or
You could display the image in a web format using HTML and Python frameworks like Flask or Django.