add simple example in kivy.uix.video.py

kivy/uix/video.py

@@ -195,3 +195,23 @@ class Video(Image):
     def on_volume(self, instance, value):
         if self._video:
             self._video.volume = value
+
+if __name__ == '__main__':
+    from kivy.app import App
+    import sys
+
+    if len(sys.argv) != 2:
+        print "usage: %s file" % sys.argv[0]
+        sys.exit(1)
+
+    class VideoApp(App):
+        def build(self):
+            self.v = Video(source=sys.argv[1], state='play')
+            self.v.bind(state=self.replay)
+            return self.v
+
+        def replay(self, *args):
+            if self.v.state == 'stop':
+                self.v.state = 'play'
+
+    VideoApp().run()