How can I create a video of what's on the screen?
Android brings a feature - built-in screen recording. This lets you use easily-accessible controls within the tablet to create a video of what's on your screen, similar to screenshots. You can even record the sound of your tablet, or use the mic to narrate what you're doing.
Swipe down to access the quick settings from any screen, and then click the “Screen recorder” icon to create (slide to the left to view it in the second page).
To further setup, go to the main menu -> “Settings” ->”Advanced features”->”Screen Recorder”