How to give Trained ANN model as an input objective function to GA or Fmincon optimization solver? Pl. provide example

I have developed feed Forward back propagation ANN , trained it and tested it. Giving fine results. It has 11 input variables and one output variable.

Now my aim is to optimize the 11 input variables to generate minimum output variables by using GA and Fmincon. For this I want to give Trained ANN model as an input objective function for GA and Fmincon. I need help on this with an example.

Thanks in anticipation

Vijay