To dream of discovering hidden cameras represents unpleasant feelings about others not trusting you. Feeling that you privacy or personal space has been violated. Feeling scrutinized or monitored with your knowledge. Embarrassment or surprise at how jealous of you someone else is. Feeling shocked at how nosy or controlling someone in your life is. Feeling that someone is too interested in your life for your comfort level.
To dream of setting up hidden cameras may represent your jealousy of someone else. Keep tabs on others without their knowledge. A lack of trust you have in someone.