Similar to film production, one needs to plan and likewise, you may need to decide if what you want to convey requires filming.
If so, think of your filmmaking as a visual speech. Thus, it should be self-contained, have a clear, concise introduction, clear summary, and a hook. Prioritize the content that you will be showcasing.
In your introduction, you should preview what you will be discussing in this lecture.
You may need to think about designing your presentation for mobile or tablets as many students may be watching your presentation on those devices.