batata.py

import cv2
import numpy as np

# Create image 300x300xrgb
height=480
width=640
image = np.zeros((height,width, 3), np.uint8)
fourcc = cv2.cv.CV_FOURCC(*'XVID')
video = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

key=0
# Create circle
r=100;x=width;y=height;
ang=0
while(key!=ord('a') and ang < 1*3.1415):

	ang=ang+0.01
	xp=r*np.cos(ang);
	yp=r*np.sin(ang);
	image2=image.copy	();
	cv2.circle(image2, (150+int(xp),150+int(yp)), 30,(10,250,250),-1)
	video.write(image2)

	cv2.imshow('image',image2)
	
	key=cv2.waitKey(1)
	print str(ang*10/3.1516) + '%'
	print video.isOpened()

video.release()
cv2.destroyAllWindows()