With the recent negative publicity about hidden cams being found by guests, I felt that over-disclosure was the best route. Before I had the video cam, I had a still photo from one of the game cams with a warning that guests could be captured if they crossed in front of one of the two cams, mounted on trees in plain sight.
When we installed the video cam, I added a screen shot with a disclosure on it to the gallery on all listings. Then we moved the cam, so I re-did a new screen shot from it, and this is the final image in all of our galleries. We also disclose it in the text of the listing and in the ‘you must also acknowledge’ section the guest sees before booking, so it’s redundant. (Edited to add: I remembered, this picture is also the last section of the check-in guide! lol) There are also 2 stickers that came with the cam, one right under the cam and one on a window that you can’t miss on the front porch so nobody can even try to claim we didn’t disclose as required.
I also felt it was important to reassure guests that these are the only cams and their privacy is respected.