[Python] how to show opencv video frame in python gtk gui?

i have try to do this from thread to an imagebox of gtk . The frames are showing successfull for some times but after 5 seconds the gui freezes and the image appears to be blank , but the thread is still running

import gi
import threading
import cv2
import time
gi.require_version("Gtk" , "3.0")
from gi.repository import Gtk , GLib , GObject , GdkPixbuf
run = True
cam = cv2.VideoCapture(0)
ret , frame = cam.read()
frame = cv2.cvtColor(frame , cv2.COLOR_BGR2RGB)
cam.release()
class MyWindow(Gtk.Window):

def __init__(self):

global cam, frame , run

Gtk.Window.__init__(self,title="Hello")
self.set_border_width(10)

image = Gtk.Image()

h, w, d = frame.shape
pixbuf = GdkPixbuf.Pixbuf.new_from_data(frame.tostring(),GdkPixbuf.Colorspace.RGB, False, 8, w, h, w*d)
image.set_from_pixbuf (pixbuf.copy())
self.add(image)
def thread_running_example():
cam = cv2.VideoCapture(0)
while run:
ret , frame = cam.read()
frame = cv2.cvtColor(frame , cv2.COLOR_BGR2RGB)
h, w, d = frame.shape
pixbuf = GdkPixbuf.Pixbuf.new_from_data(frame.tostring(), GdkPixbuf.Colorspace.RGB, False, 8, w, h, w*d)
image.set_from_pixbuf (pixbuf.copy())



thread = threading.Thread( target = thread_running_example )
thread.daemon=True
thread.start()

win = MyWindow()
win.connect("destroy" , Gtk.main_quit )
win.show_all()
Gtk.main()

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