Since I don't use it myself, I have no idea which libraries might actually work. I'm guessing that the most important things to look for will be:
1) make sure the version of CodeIgniter you're using is at least close to the version supported by the library (i.e. CodeIgniter v2.x vs. CodeIgniter v3.x).
2) check to see whether it has been recently updated or other people have mentioned a lot of problems getting it to work.