There are 3 roles that video can play in a presentation
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.
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.
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.
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