what kind of tracking do you plan to use?
color tracking,
filming the hand from above ? whats the setup ?

There's a special computer vision section in the contributed libraries reference. Most of them probably have examples.

Also check out this video by Matt Ditton for some inspiration. Face PONG with Processing and openCV.

@ cedrickiefer I'm planning to use maybe motion detection?

@ amnon.owed
Yea I've seen some of those examples, but some didn't worked on my computer. However, I am still very confused on how do I actually make use of the codes to complete my project. I can understand alittle on how the thing works (the logic behind it) but the biggest problem is the coding because I don't know what they mean.

Thanks for helping :D
Much appreciated