No, fzero() can only alter a single real-valued number and the fitness function must return a single real-valued result that crosses 0 (fzero is not suitable for functions that only touch zero such as sum(abs(Vectors)) )
If you are working with multiple values (including real and imaginary parts of a single variable) then you should be using a function from the Optimization Toolbox or the Global Optimization Toolbox. The functions that are provided in base MATLAB operate on a single real value and need a single real result.
