to show text in the main frame you have to change gstreamer
here is an example insert frame count in your hailo detection App
you can insert water mark text etc. just remember to do it after the hailo chain
to do it in callback function you have use –u on command line and the bounderings boxes from hailo are NOT set ind the frame. It will decrease the fps with 50% From my example you can set your on text and just make more layers it is not going to have a severe impact on output.