If you have any videos that you've created (or that you have permission to include within your guide), they'll be an excellent compliment to your content.
While they aren't required, they do help boost the appeal and ratings of your guide. People love short videos.
Even videos created with a webcam can add tremendous amount of clarification and a feeling of connection between the reader and you. You'll first need to upload your video to a hosting service like YouTube, Vimeo or Wistia. Then you can copy the video embed code and use the Guide editor to embed your video with this button: