import cv2
import time
import simpleaudio as sa

def playSound():
    wave_obj = sa.WaveObject.from_wave_file("alert.wav")
    play_obj = wave_obj.play()
    
video = cv2.VideoCapture("another_video.mp4")

classifier_file = 'cars.xml'

car_tracker = cv2.CascadeClassifier(classifier_file)


while True:
    (read_successful, frame) = video.read()

    if read_successful:
        grayscaled_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    else: 
        break
    
    cars = car_tracker.detectMultiScale(grayscaled_frame, 1.1,6,2) 
    
    for (x,y,w,h) in cars:
        cv2.rectangle(frame, (x, y), (x+w, y+h), (0,255,0), 3)
        playSound()
    cv2.imshow('window', frame)
    cv2.waitKey(1)