There are 3 roles that video can play in a presentation

1. Recording. This video does not add anything to the presentation, it is simply a narrative of what you want to say. Especially useful when you are not there to present slides. Example: a TED talk video.

2. Decoration. Spectacular visual and sound effects (try to) enhance something that can also be expressed using “regular” slides. Example: an expensive introduction commercial of a new iPhone.

3. Explanation. The video does a better job at explaining something than a regular slide. Example: an animation of how a vaccine impacts a virus.

Think about these when the question “do we need a video” comes up.