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If you catch the landlord in your apartment without permission, then I would take the video to the police and let them know that (1) you caught your landlord in your apartment without permission, and (2) you noticed things missing in the past (which is why you set up the video camera). The police may investigate further, and if they interview the landlord, perhaps put a scare in her such that she doesn't do it again. After all, unless the landlord has your permission or is dealing with a legitimate issue regarding the property, then she is trespassing.
Does that answer your question? Please let me know if you need clarification, as I am happy to continue helping you until you are satisfied.