pip install opencv-pyhton

pip install imutils

pip install threading

pip install winsound

import cv2
import imutils
import threading 
import winsound
cap = cv2.VideoCapture(0 , cv2.CAP_DSHOW)

cap.set(cv2.CAP_PROP_FRAME_WIDTH , 640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT , 480)



_, start_frame = cap.read()
start_frame = imutils.resize(start_frame , width=500)
start_frame = cv2.cvtColor(start_frame,cv2.COLOR_BGR2GRAY)
start_frame = cv2.GaussianBlur(start_frame,(21,21), 0 )




alarm = False
alarm_mode = False
alarm_counter = 0




def beep_alarm():
    global alarm
    for _ in range(5):
        if not alarm_mode :
            break
        winsound.Beep(2500,2500)
    alarm = False
    

while True :
    ret, frame = cap.read()
    frame = imutils.resize(frame,width=500)
    if alarm_mode:
        frame_bw = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
        frame_bw = cv2.GaussianBlur(frame_bw,(5,5), 0)
        diffrence = cv2.absdiff(frame_bw , start_frame)
        threshold = cv2.threshold(diffrence,25,255,cv2.THRESH_BINARY )[1]
        start_frame = frame_bw

        if threshold.sum() > 1 :
            alarm_counter += 1
            
        else :
            if alarm_counter > 0 :
                alarm_counter -= 1
        cv2.imshow("Cam" , threshold)
    else :
        cv2.imshow("Cam" , frame)

    if alarm_counter > 10 :
        if not alarm:
            alarm = True
            threading.Thread(target=beep_alarm).start()
           

    Key_preesed = cv2.waitKey(30)
    if Key_preesed == ord("t"):
        alarm_mode = not alarm_mode
        alarm_counter = 0
        
       
    if Key_preesed == ord("q"):
        alarm_mode = False
        break
    
cap.release()
cv2.destroyAllWindows()