Getting a QT creator error when installing uWho in Ubuntu 14.04

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I'm running Ubuntu 14.04 LTS, and have OpenCV 3.0.0 installed. I downloaded the zip file from github (https://github.com/jwcrawley/uWho) and changed my directory in Qt, but when I try to run it, it gives me an error:

         /home/dave/Downloads/uWho-master/mainwindow.h:6: error: opencv2/core.hpp: No such file or directory
          #include <opencv2/core.hpp>
                           ^

What am I doing wrong here? Does uWho not work on the newest OpenCV? I would very much appreciate your help.