Do you think that taking a video of someone can change their behavior?

A friend of mine and his wife have an attention demanding son. My friend is frustrated with his wife because her behavior makes the problem with their son worse.

For example, the son will ask a question he already knows the answer to, like, “Do we have school today?” as he’s getting ready for school. Mom will actually answer the kid, where upon he’ll ask more dumb questions and she’ll keep answering them.

My friend gets his son ready for school in the mornings, and he has been late to school all week because he’ll spend 15 minutes back in the bedroom talking with his mom, who is still in bed. Rather than telling him to go on and get ready, she’ll talk to him.

My friend has tried to talk to her, but she gets defensive.

Since he’s talked to her, I told him maybe he could get her permission to video them when the boy starts playing his games, so she can see what my friend is talking about.

What are your thoughts on such an idea?