Adding to OpenCV dataset library

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Hi, I want to use the dataset library opencv has, however, I can't seem to get it to work.

I tried installing ros-opencv3

sudo apt-get install ros-indigo-opencv3

but It doesn't add the desired library, and moreover, it causes my code not to recognize the opencv libraries (e.g. Mat structure).

Does anybody have a direction how to install an additional library? And is it possible to install opencv alongside ROS? if so how?

Thanks