import numpy as np
import cv2
import math

cap = cv2.VideoCapture(0)

#fgbg = cv2.BackgroundSubtractorMOG()

while(1):
    ret, frame = cap.read()
    gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)

#    fgmask = fgbg.apply(frame)

    corners = cv2.goodFeaturesToTrack(gray,25,0.01,10)
    corners = np.int0(corners)

    for i in corners:
    	x,y = i.ravel()
    	cv2.circle(frame,(x,y),3,255,-1)
    
    cv2.imshow('esquinas frame',frame)
    cv2.imshow('grises',gray)
    k = cv2.waitKey(30) & 0xff
    if k == 27:
        break

cap.release()
cv2.destroyAllWindows()