[Mobile]Tracking object thought mobile camera

Hey,
I don't know if it's the right section but anyway:
I want to know how to make this:
mobile camera app that you face the camera infront of a wall and when you click on the screen a picture will appear. NOW, when you move the phone(and also the camera), and picture will track and stay at he same place. so when you move back the camera infront of the wall and picture will be display again.
I want to know how to make the picture tracks and specific place of the wall in my room and when i move the camera from the wall, the picture will track the wall and stays when the wall is placed.
Thanks in advance

 

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https://www.assetstore.unity3d.com/en/#!/content/74050

 

thanks for your reply, if you know how exactlly i can use this plugin for my need i would be glad if you will be able to direct me to the right section or give me a youtube tutorial or something .

 

I haven't used Vuforia, but they have a lot of documentation, tutorials, community, etc. I would start here:

https://library.vuforia.com/tutorials

Or 'Getting Started':
https://library.vuforia.com/getting-started

 

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