import cv2,time

first_frame = None

video = cv2.VideoCaputre(0)

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

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    gray = cv2.GaussianBlur(gray,(21,21),0)

    if first_frame is None:
        first_frame = gray
        continue

delta_frame = cv2.absdiff(first_frame,gray)
thresh_delta = cv2.threshold(delta_frame,30,255, cv2.THRESH_BINARY)[1]
thresh_delta = cv2.dilate(thresh_delta, None, iterations = 0)

(_,cnts,_) = cv2.findContours(thresh_delta.copy(),cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)

for contour in cnts:
    if cv2.contourArea(contour) < 1000:
        continue
    (x,y,w,h) = cv2.boundingRect(contour)
    cv2.rectangle(frame, (x,y), (x+w,y+h),(0,255,0),3)

cv2.imshow('frame',frame)
cv2.imshow('Capturing',gray)
cv2.imshow('delta',delta_frame)
cv2.imshow('thresh',thresh_delta)

key = cv2.waitKey(1)
if key== ord('q'):
    break

video.release()

cv2.destroyAllWindows()