Wanna knw how to build this Virtual Reality App!

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I saw this s/w once at a museum - and i wanna know if i can build something like it for a project that i need for college

It consists of: A screen, with a bunch of drums scattered around, and when you stand in front of the screen u are projected into it, and you can see yourself standing in the screen with drums all around you, and if you move your hand over a drum, a beat plays (like you've hit a drum for real) an when you hit another one, another drum beat plays..

now i really am fascinated by the idea of this, and want to use the same idea to build a project for myself. Only problem, i dont know where i should start.

So far what i have figured out is that i will need some way to scan the user and to track his movements and accordingly process the sound based on location of his hand..but how do i go about that i am not really sure. Also, what language will i use to build this, again, i am not sure. was thinking JAVA...

Any help would be appreciated!
Thanks
Rashmi