When editing a recipe you'll be able to add an image or video to each instruction step using the icons next to that instruction:
Videos can either be uploaded or embedded from various sources (like Youtube, Vimeo or your ad company). Both images and videos will be used in the recipe metadata as well.
If you have a main recipe video set you'll also be able to use the icon on the right to indicate that this instruction step is covered in the main video:
You can then set a start time, end time and name. This information will be used in the recipe metadata as well.