@Rafael230
Yes, most definitely. I would even keep sending messages to them until they respond via Airbnb confirming that they have read and understand the updated security camera information. As @Sarah977 said, give them the option to cancel if they are not okay with it. You do not want anyone staying with you who might be opposed to a outside camera. Even if it is stated in your listing. Always confirm with them via messaging that they are aware. Airbnb will suspend your account if someone complains.