I had the same need, so I'm starting a Qt5-based tmdb access library, since I couldn't find one anywhere. It's currently at http://quickgit.kde.org/?p=scratch/dfaure/libtmdbqt.git
(if you read this in the far future and you can't find it, try http://quickgit.kde.org/?p=libtmdbqt.git)
Contributions welcome, there is much to do still (but at least I can query for movies and get results, already...)
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