import cv2
import winsound
camera = cv2.VideoCapture(0)
while camera.isOpened():
    ret, frame1 = camera.read()
    ret, frame2 = camera.read()
    diff = cv2.absdiff(frame1,frame2)
    grey = cv2.cvtColor(diff,cv2.COLOR_RGB2GRAY)
    blur = cv2.GaussianBlur(grey,(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.Beep(500,600)
    if cv2.waitKey(10) == ord('a'):
        break
    cv2.imshow('Security Camera', frame1)