glfilterapp recordgraphic example doesn't work

Hello everyone.

I'm trying to use glfilterapp gl-plugin to draw on the videostream.

For this I try to run this example:

https://github.com/GStreamer/gst-plugins-base/blob/1.18.3/tests/examples/gl/generic/recordgraphic/main.cpp

But here I get a link error.

Anyway, if I get rid of the caps filtering and put only glimagesink after glfilterapp and gltestsrc before it, I run into black screen. Also if I don't pass a draw-callback into glfilterapp, videostream flows just fine.

I can't use glimagesink for drawing, like here: https://github.com/GStreamer/gst-plugins-base/blob/1.18.3/tests/examples/gl/generic/cube/main.cpp Because I just need to draw on the video without displaying it immediately.

So, could you please explain me how to change this example in order to draw something using glfilterapp?

My GStreamer version is 1.16.2.

Thanks.