If you live in Maryland I think you can do what ever the hell you want as it pertains to audio/video recording on private property, yes you have 2 party consent laws as it applies to specific audio recordings, however remember the audio portion of a recording can always be stripped out/ommited, however it would be better to have it available if it helps, then to not have it at all.
Unlawful acts. -- Except as otherwise provided in this subtitle it is unlawful for any person to: (1) Willfully intercept, endeavor to intercept, or procure any other person to intercept or endeavor to intercept, any wire, oral, or electronic communication;
(2) Willfully disclose, or endeavor to disclose, to any other person the contents of any wire, oral, or electronic communication, knowing or having reason to know that the information was obtained through the interception of a wire, oral, or electronic communication in violation of this subtitle; or
(3) Willfully use, or endeavor to use, the contents of any wire, oral, or electronic communication, knowing or having reason to know that the information was obtained through the interception of a wire, oral, or electronic communication in violation of this subtitle. Cts. & Jud. Proc. §10-402(a)(1)-(a)(3). (emphasis added)