How to change object on the basis of marker position in Augmented Reality Vuforia?

I am working on a project, there I need two types of object. If i keep the marker vertical then i should see one type of object and if i keep the marker horizontal then i should see another object.

Idea is something like this here I get from a youtube video. https://www.youtube.com/watch?v=vf_zilBDzH8

I am using Unity 3d and Vuforia for my project.

Anyone here to help me please? Thanks in advance :)