Finding circles in a live video feed using python 2.7.11and opencv 3.0.0

Question

I need help finding circles in a live video feed from my webcam. I just need feedback from python that a circle has or has not been detected. Also what is the best method for finding the size of the circle in pixels for better detection. My code so far

import cv2
import numpy as np
import sys

cap = cv2.VideoCapture(0)

while(True):

    ret, frame = cap.read()


    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    gray = cv2.medianBlur(gray,5)
    cimg = frame.copy()
    circles = cv2.HoughCircles(gray, cv2.HOUGH_GRADIENT, 1, 10, np.array([]), 200, 100, 100, 200)
    if circles == 1:
        print('Circle true')
    else:
        print('No circle')
    cv2.imshow('video',gray)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break


cap.release()
cv2.destroyAllWindows()

Answer 1

There it is !

import cv2
import numpy as np
import sys
cap = cv2.VideoCapture(0)
while(True):
    gray = cv2.medianBlur(cv2.cvtColor(cap.read()[1], cv2.COLOR_BGR2GRAY),5)
    cirles=cv2.HoughCircles(gray, cv2.HOUGH_GRADIENT, 1, 10)# ret=[[Xpos,Ypos,Radius],...]
    if cirles!=None:print "Circle There !"
    cv2.imshow('video',gray)
    if cv2.waitKey(1)==27:# esc Key
        break
cap.release()
cv2.destroyAllWindows()