Unity lens to search for tags

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http://askubuntu.com – I want to develop a dash lens to search files by tags (the ones that are set through Nautilus). I know on the one hand this program, that does the search: http://manpages.ubuntu.com/manpages/natty/man1/tracker-tag.1.html But, other than that, I don't know where to start. Where can I learn how to do it? I have a good knowledge of C/C++ and Linux/POSIX, but I never developed for a graphical interface and less than anything for Unity. I also would want an opinion about the "tags" option in Nautilus, is it there to stay? I wouldn't want to develop something that is doomed next version. And final (HowTos)