How to use cairooverlay to draw onto window

[kususe]

I wanna understand how to use cairooverlay to draw during a video playing,
cause simply overlaying svg images (created wuth matplotlib ad displayed
whit rsvgoverlay plugin) got me a memory leak. 
So, I tried on a drawable window using pygk, but how to link this with
cairooverlay?
I coded:

self.player.get_by_name("cairooverlay").connect("draw",self.draw)
....

def draw_line(self):
	points=[(100,100),(200,200),(300,300),(400,400)]
	self.movie_window.window.draw_lines(self.gc, points)
	self.pangolayout.set_text("Line")
	self.movie_window.window.draw_layout(self.gc, 5, 50, self.pangolayout)

but I got an error:
draw_line() takes exactly 1 argument (5 given)


but
Other suggestions?
(Coglogoinsert returns me a segfaults, yet reported to Bugzilla)
thanks, 
K.

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