If you havenβt worked a lot with Android, first of all, with capturing and overlaying your video streams, I would say that creating an application with augmented reality will be very difficult. I was working on a project that collected and analyzed real-time video streams through an android for analysis on a device and found it rather complicated.
If you are looking for an alternative, I would suggest a static mapping application that shows the library layout, your current location on the terminal, which provides a Dewey Decimal listing, and the calculated location of the book that they just looked at. You can even add a section on the Dewey decimal classification system and become your librarian's best friend.
If you really want to switch to live indoor navigation, the best choice would be a combination of compass and accelerometer data so that you can determine the direction and distance when the user moves around the environment. There are some good documents regarding this, but you may need to go through the IEEE or ACM libraries to find them.
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