You have to justify the use of storing (or publishing, don't remember) content that includes PII. You must register the use of cameras and specify how long and why you store those recordings. Which usually states: For security purposes. You must include (at least my country) a sticker that says particular area under surveillance.
When there is collective photographing at school for children, we as parents must consent with a signature... which is a little bit annoying.
Having camera at home/yard is no issue.
