text: import tkinter as tk
  from tkinter import *
  
  import cap as cap
  import cv2
  from PIL import Image, ImageTk
  import os
  import numpy as np
  
  
  # creating global variable
  global last_frame1
  
  last_frame1 = np.zeros((480, 640, 3), dtype=np.uint8)
  
  # creating global variable
  global last_frame2
  last_frame2 = np.zeros((480, 640, 3), dtype=np.uint8)
  global cap1
  global cap2
  cap1 = cv2.VideoCapture("path_to_input_test_video")
  cap2 = cv2.VideoCapture("path_to_resultant_lane_detected_video")
  
  
  def show_vid():
      if not cap1.isOpened():
          print("cant open the camera1")
      flag1, frame1 = cap1.read()
      frame1 = cv2.resize(frame1,(400,500))
      if flag1 is None:
          print ("Major error!")
      elif flag1:
          global last_frame1
          last_frame1 = frame1.copy()
          pic = cv2.cvtColor(last_frame1, cv2.COLOR_BGR2RGB)
          img = Image.fromarray(pic)
          imgtk = ImageTk.PhotoImage(image=img)
          lmain.imgtk = imgtk
          lmain.configure(image=imgtk)
          lmain.after(10, show_vid)
  
  
  def show_vid2():
      if not cap2.isOpened():
          print("cant open the camera2")
      flag2, frame2 = cap2.read()
      frame2 = cv2.resize(frame2,(400,500))
      if flag2 is None:
          print ("Major error2!")
      elif flag2:
          global last_frame2
          last_frame2 = frame2.copy()
          pic2 = cv2.cvtColor(last_frame2, cv2.COLOR_BGR2RGB)
          img2 = Image.fromarray(pic2)
          img2tk = ImageTk.PhotoImage(image=img2)
          lmain2.img2tk = img2tk
          lmain2.configure(image=img2tk)
          lmain2.after(10, show_vid2)
  
  
  if __name__ == '__main__':
      root = tk.Tk()
      lmain = tk.Label(master=root)
      lmain2 = tk.Label(master=root)
      lmain.pack(side = LEFT)
      lmain2.pack(side = RIGHT)
      root.title("Lane-line detection")
      root.geometry("900x700+100+10")
      exitbutton = Button(root, text='Quit',fg="red",command=   root.destroy).pack(side = BOTTOM,)
      show_vid()
      show_vid2()
      root.mainloop()
      cap.release()
  
  