Grasshopper 3D vs Proceessing For Interactive ARt

Hi Everyone,

I have idea about making one interactive Artwork .. where i want to use camera to capture video and that will be converted into different form  .. this i want to happen Real time.. so for this purpose what is the best option or Light weight option in which it will not take more power of Computer and process will not use that much of computation power .

So what should i use Grasshoper 3d with Firefly or Proccessing