A security camera is read as being watched or judged, and also as watchfulness of your own. Dream books link it to self-consciousness and the feeling that every move is on record.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.