I'm using Bullet Physics and looking to create mesh damage, for example a tank moving over a car and the car get completely damaged, is it possible to do that through Bullet Physics?

I think I've seen something about that on the demos included in Bullet. You might need to play with GIMPact or soft bodies. I don't think Bullet has a specific call to "make this thing damaged", but odds are it might support that to a certain degree.
There's a demo, I think it's called ConvexDecomposition showing complete fracturing of a table object. But deformation is going to be different.