The opening to that video was made with Kukarella. Kukarella.com converts text to voice to use in videos or activities. Maybe you want to include a reading of the directions for your students but you want to change it up instead of just your voice. Kukarella gives you lots of options to have your words read by other voices. It’s fun, go play with it and give it a try with your kids. You could have your students use it to convert their own writing to a recorded voice.