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How to do AR on a big screen, need some input

I am new to AR development and cant really code, yeah im one of those :P

I am working on a project in school an would like to do something like this http://youtu.be/jEW0LdNuFXY

Im testing it at my livingroom where i have a target image on the floor and then want to add water on the floor, but i have some problems1: The target is 2-3 meters from the webcam im using, but the webcam cant read the target on the floor, so i have to move it closer to the webcam by hand and then place it back on the floor when the AR is activated.

2: When the AR is running the water is on the screen, but it is not flat on the floor on top of the target image, when i think about it, it looks like the water is placed in air maybe where i hold the target image by hand.

What i want to do, i the webcam to recognize the target image on the floor X meters away from the webcam (the moviefeed is clear and sharp), but i dont know how or where to do it.Then i want the water to lay flat on the floor on top of the target image.

I have made a picture of the setup right now:[img]http://soulstones.dk/upload/help/AR_Help.jpg[/img]

So what im using right now is a Computer, Webcam, Vuforia, Unity, TV

I hope someone can help me, and please explain it for dummies :)

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