encapsulating cairooverlay in custom plugin

[tom]

I see the example of the cairooverlay at

https://github.com/GStreamer/gst-plugins-good/blob/master/tests/examples/cairo/cairo_overlay.c

and I would like to encapsulate this example in a plugin, which type would
be the best ?

so i could do :
gst-launch-1.0 videotestsrc pattern=13 ! mycairoencapsulation !
autovideosink

I tried to do it in a GST_BIN but the pad's don't get connected.
i tried to do it in a GST_TYPE_VIDEO_FILTER but the output is completely
messed up.

Is there an example that already has this encapsulated with a simple draw
function ?
or if there isn't which direction should i go in ?

Thanks,
Tom
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