You can use your own Controller by extending Voyager's Controllers. To do it, first define your controller Namespace at config/voyager.php :
/*|--------------------------------------------------------------------------| Controllers config|--------------------------------------------------------------------------|| Here you can specify voyager controller settings|*/'controllers'=> ['namespace'=>'App\\Http\\Controllers\\Voyager',],
then run php artisan voyager:controllers, voyager will now use the child controllers which will be created at App/Http/Controllers/Voyager