Without your consent or knowledge, the landlord cannot install or maintain hidden cameras inside your unit. While there is a prohibition against recording a person's voice without their consent (i.e., a secretly recorded conversation in which one party did not consent to the recording cannot be introduced as evidence in Court), I do not believe there is such a prohibition against a purely video recording. The audio cannot be introduced, but the video might be able to serve as evidence. You need to consult with a litigation attorney to review the applicable case law which might allow you to prevent the video from being introduced as evidence on some other grounds, but there is no express prohibition against the use of purely video-taped recordings even without someone's consent in Court.
David L. Gibbs, Esq.
The Gibbs Law Firm, APC
San Clemente, California
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