Opencv Sound Alert Camera

import cv2

import winsound

cam = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')

out = cv2.VideoWriter('subscribe.mp4',fourcc, 20.0, (640,480))

while cam.isOpened():

    ret, frame1 = cam.read()

    ret, frame2 = cam.read()

    diff = cv2.absdiff(frame1, frame2)

    gray = cv2.cvtColor(diff, cv2.COLOR_RGB2GRAY)

    blur = cv2.GaussianBlur(gray, (5, 5), 0)

    _, thresh = cv2.threshold(blur, 20, 255, cv2.THRESH_BINARY)

    dilated = cv2.dilate(thresh, None, iterations=3)

    contours, _ = cv2.findContours(dilated, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

    # cv2.drawContours(frame1, contours, -1, (0, 255, 0), 2)

    for c in contours:

        if cv2.contourArea(c) < 5000:

            continue

        x, y, w, h = cv2.boundingRect(c)

        cv2.rectangle(frame1, (x, y), (x+w, y+h), (0, 255, 0), 2)

        winsound.PlaySound('alert.wav', winsound.SND_ASYNC)

    if cv2.waitKey(10) == ord('q'):

        break

    out.write(frame1)

    cv2.imshow('Camera', frame1)