I have a question if you work in a childcare setting you are aware of video camera but is it against the law to have video recording and not be aware

There is no employment law that would prohibit video recording and no employment law that says you have a right to refuse to work if someone is listening to your conversation.  There is a federal criminal law dealing with wiretapping that prohibits someone from recording audio without being a part of the conversation or consent.  However, a notice that you are or may be recorded likely is sufficient notice for consent (think customer service calls) under that law.