text: import cv2
  #importing winsound to make a noise when bulgulary movement is detected
  import winsound
  #reading camera(webcam of laptop) and capturing video info in variable cam
  cam = cv2.VideoCapture(0)
  #turning on camera and using while loop
  
  while cam.isOpened():
      ret, frame1 = cam.read()
      ret, frame2 = cam.read()
          #we capture 2 respective instances of the webcam and find the diff b/w them , if diff=!0 then the object infromt of the cam has moved and motion is detected
      diff = cv2.absdiff(frame1, frame2)
      #converting diff color to grey color
      gray = cv2.cvtColor(diff, cv2.COLOR_RGB2GRAY)
      blur = cv2.GaussianBlur(gray, (5, 5), 0)
      #getting rid of the noise by setting the threshhold
      _, thresh = cv2.threshold(blur, 20, 255, cv2.THRESH_BINARY )
      #using some dilation after getting rid of the noise to amplify the focus objects
      #passing thresh as paramter to be dilated and passing kernels= none and dilating 3 times
      dilated = cv2.dilate(thresh, None, iterations=3)
      #setting contours boxes around objects that are moving to detect them
      contours, _ = cv2.findContours(dilated, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
      #drawing contours around frame1 , press -1 to draw everything, with rgb value green and thickness =2
      # cv2.drawContours(frame1, contours, -1, (0, 255, 0), 2)
      for c in contours:
          #setting condition to detect only big moving objects and neglecting minor details
          #if area < 5000 ignore that movement
          if cv2.contourArea(c) < 5000:
              continue
          #drawing contour box with parameter x,y,w,h
          x, y, w, h = cv2.boundingRect(c)
          cv2.rectangle(frame1, (x,y), (x+w, y+h), (0,255,0), 2)
          #calling winsound to make a beep noise with freq 500 and duration 200 msec
          winsound.Beep(500, 200)
  
  
  
      #waiting 10 secs to know whether user presses a key(q) on computer , if yes then destroy the window
      if cv2.waitKey(10) == ord('q'):
          break
      #activating webcam and displaying video
      cv2.imshow("security cam 1, press q to exit", frame1)
  
  