This peer modelling video was made using the SCREENCASTIFY app (extension for Chrome Browser):
Perhaps even easier to use than Screencastify is the Adobe Spark app. Again, this effectively makes a video out of still photograph slides, and you can record your own voice over each slide, and add music too.
OPEN BROADCASTER SOFTWARE
Like Screencastify, OBS is a screen recording app; but, you must download and install it. You will probably want to edit the video in a video editing app as it is very difficult to make a video in one take without errors (although sometimes it is worth a try, and a few errors can even make the video 'more natural'.