video.py

import os
import numpy
import cv2

folder = input("Path to the folder where the videos are: ")
files = os.listdir(folder)

i = 0
n = len(files)

while True:
    vid = cv2.VideoCapture(folder + '/' + files[i])
    while vid.isOpened():
        ret, frame = vid.read()
        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

        cv2.imshow('frame',gray)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    vid.release()
    i += 1
    i %= n

cv2.destroyAllWindows()