Unless you've been living under a rock or ensconced in a cave for the last decade, you know cameras are everywhere; literally everywhere. As a home buyer, you also know (should anyway) that the home seller is watching and listening to everything you say and do. So pick an analogy..."less said, best said" is a good one.
Requirements to disclose this type of vary. In Georgia, there is NO obligation to disclose recording devices in homes for sale. It's common courtesy and good practice for listing agents to mention this in the private agent remarks. It's wise for buyer agents to assume recording devices are in place. Check for exterior cameras on the approach, doorbell cams at the door and interior cameras throughout the home.
This is a double edged sword. Sellers claim the need for security; however as much as anything they are likely curious to see what buyers are saying. Some buyers find being watched unsettling and there have been situations where clients are put off knowing they are under observation.
Point is, buyers should assume that the home seller is watching and listening. Zip it, talk about the home out in the street and don't say anything in the home. Sellers and listing agents should consider at least making this clear or better, disabling them during visits. Buyer agents, even though not having a fiduciary obligation, should warn clients. Remember, as the general counsel for the GA Association of Realtors explains, all of this is perfectly legal in Georgia.