Ever want to explain something to students that is more than a static Word/Excel/PowerPoint/OneNote document can offer? Microsoft added an “Ink Replay” feature to Office suite in August 2016.
You can see a demonstration at
Rewind and replay handwritten notes or drawings. Simply draw your diagrams and equations using a touch screen device with a pen or your finger in your familiar application. The strokes are recorded. Then students can play it back as a video, rewind, or fast forward as needed within the document. No need to use additional software or camera.
Give it a try.