Tracking Deal or No Deal [incomplete]

dondact.py

import cv2
import numpy as np
import sys
import matplotlib.pyplot as plt


# Create a VideoCapture object and read from input file
# If the input is the camera, pass 0 instead of the video file name
cap = cv2.VideoCapture(sys.argv[1])

# Check if camera opened successfully
if (cap.isOpened()== False):
  print("Error opening video stream or file")

start = None
ys = []

# Read until video is completed
while(cap.isOpened()):
  # Capture frame-by-frame
  ret, frame = cap.read()
  if start is None:
    start = frame

  if ret == False:
    break

  # Display the resulting frame
  cv2.imshow('Frame',frame)

  # Press Q on keyboard to  exit
  if cv2.waitKey(25) & 0xFF == ord('q'):
    break

  ys.append(cv2.norm(cv2.subtract(frame, start)))
  print(ys[-1])


# When everything done, release the video capture object
cap.release()

# Closes all the frames
cv2.destroyAllWindows()

plt.plot(range(len(ys)), ys)
plt.show()