I'm not sure gender really plays a role in the security field, but I would encourage you to not let your gender limit you? As long as security systems or cameras are things that you're passionate about it can be a really fun job. You can play around with different solutions to meet your customer's needs. For example one of my favorite cases is combining Axis camera+Skyrec VMS+BOSCH safety alarm and it was really rewarding to see how satisfied my client was. You can look up these companies and watch some demo videos if they have any.