import numpy as np
import cv2

cap = cv2.VideoCapture('test.avi')
kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(3,3))
fgbg = cv2.createBackgroundSubtractorMOG2()
while(True):
    ret, frame = cap.read()
    fgmask = fgbg.apply(frame)
    fgmask = cv2.morphologyEx(fgmask, cv2.MORPH_OPEN, kernel)
    im, contours, hierarchy = cv2.findContours(fgmask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    for c in contours:
        perimeter = cv2.arcLength(c,True)
        if perimeter > 180:
            x,y,w,h = cv2.boundingRect(c)
            cv2.rectangle(frame, (x, y), (x+w, y+h), (123, 123, 17), 2)
    cv2.imshow('frame',frame)
    cv2.imshow('fgmask', fgmask)
    k = cv2.waitKey(100) & 0xff
    if k == 27:
        break

cap.release()
cv2.destroyAllWindows()