From the video description:
Take a look at how the teachers at Cary Academy in Cary, North Carolina, seamlessly integrate OneNote into their classrooms to elevate the education of students through presentation, organization, and real-time collaboration with both students and other educators.
Office365 is also mentioned, plus I should say that there's very little on phones here, but then OneNote is fully portable between PCs, tablets and phones, so at the very least this might get you thinking about what you use OneNote for?
Notable is that all the laptops being used seem to have touchscreens, so thery're high end - the cost of issuing these to classes of 30 kids at a time shouldn't be underestimated, though the long term benefits are evident.
Also, is it just me, or do those kids look rather young to be learning that rather advanced maths?