import numpy as np
import cv2

cap = cv2.VideoCapture(0)
ret, frame = cap.read()
minLineLength = 600
maxLineGap = 5

while(1):
    ret, frame = cap.read()

    gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    edges = cv2.Canny(gray,50,150,apertureSize = 3)

    lines = cv2.HoughLinesP(edges,1,np.pi/180,50,minLineLength,maxLineGap)
    if lines is not None :
      for x1,y1,x2,y2 in lines[0]:
    	cv2.line(frame,(x1,y1),(x2,y2),(0,255,0),2)
    
    cv2.imshow('frame o',frame)
    k = cv2.waitKey(30) & 0xff
    if k == 27:
        break

cap.release()
cv2.destroyAllWindows()