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Hi I came to know this Question was asked on 2014. But I am in opencv from last month. May this will help others in future.

import numpy as np
import cv2


cap = cv2.VideoCapture("mydata/video.avi")

while(True):
  # Capture frame-by-frame
   ret, frame = cap.read()

   # Our operations on the frame come here
   gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
   blur = cv2.GaussianBlur(gray,(5,5),0)
   ret, thresh_img = cv2.threshold(blur,91,255,cv2.THRESH_BINARY)

    contours =  cv2.findContours(thresh_img,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)[-2]
    for c in contours:
        cv2.drawContours(frame, [c], -1, (0,255,0), 3)

     # Display the resulting frame
    cv2.imshow('frame',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()