How Can I Record My Granddaughter Playing Videogames for Youtube?

Ivan's granddaughter would like to capture the screen of an iPad and add visual commentary. Leo says she wants to be a youtube star! Leo says the iPad can't do both. It does have a built-in screen recorder. Then you can record her with a camera and then edit the two together on a computer with a picture in picture option. Another option is an open source program called OBS Studio that can do it in real time on a computer. It's mostly used in making screencasts.