You can still track a can but you need to find one that has some textures and is not that reflective. If you place an image on top of the can then you can still go with Object Recognition as you would be adding more texture on your object.
I'm having issues tracking a can. I'm able to get the can into a wto file and it does work but it seems the reflections cause some issues where it often loses the object. My can has a specific image on it that's used for tracking so would it be better to use an image track for this?