Don’t try to cram too much information on a slide or page. Allowing a bit of space around text stops the information appearing too dense and helps to separate sections. You also need to keep a clear border around the edge of each slide.
A video presentation may be a videoed performance of a slide presentation. You need to follow the same guidance for using slides and to consider how to verbally present your work. As you don’t have a live audience, you might want to consider using a script. This can be marked up with pauses and points of emphasis.
Just as a video needs visual aids to illustrate your presentation, a podcast can use audio illustrations. Using sound to set the scene or underscore a quotation might be ways to enhance this audio presentation. Like an essay, a podcast has a clear purpose, uses source material to explore your response and creates a thoughtful argument. Wiki Common contains copyright-free audio, as does the YouTube Audio Library – these also need attribution.