From HUD?
APawn* Pawn = GetOwningPawn();
if(Pawn && Pawn->Controller && Pawn->Controller->IsA(AtdaController::StaticClass())) {
((AtdaController*)Pawn->Controller)->showMouseCursor();
}
All classes related to eachother in anyway usally keep refrences to eachother, so use API refrence to check how to get specific object of a class.