Here is a compilation video of several student videos from previous years. All of these videos are excellent examples of what is possible.
They are all largely based on footage they have found online. You are not required to be visible on screen and you may even use text-to-speech or a friend to record your narration.
There is specific guidance for the video coursework on the ELE page, here: https://vle.exeter.ac.uk/course/view.php?id=10327#section-2