openCV_camTest.py

import cv2

# The device number might be 0 or 1 depending on the device and the webcam.
cap = cv2.VideoCapture()
cap.open(0, cv2.CAP_DSHOW)

# this if is in case I want to open a video file that does not exists in a path for cv2.VideoCapture('path')
if not cap.isOpened():
    raise IOError("Cannot open file")

# this line here is only to give the window a name before the loop so I
# can have a reference for the getWindowProperty window name.
cv2.namedWindow("frame", cv2.WINDOW_AUTOSIZE)

# getWindowProperty will return -1 if if try to close it with my mouse, weird.... (but useful)
while(cv2.getWindowProperty('frame', 0) >= 0):
    ret, frame = cap.read()
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

# TODO: I should try to wrap cv2 inside tkinter GUI to add more elements to the window