Ewright
In the app, under Camera Mode, choose Photo + Video. You will probably want 10 second video, 1024 * 576, sound ON.
When you get an interesting photo, you request the video just like you do an HD photo. It won’t come in until the next time the camera contacts the server so you’ll want to set some scheduled events every few hours to force the camper to check in so you don’t have to wait hours and hours to get your HD photo or video.