Images/themes/identity
Don't forget about cover and section images – These will make your video content look more polished and more uniform when it is posted or embedded. Is there a series of videos that share a theme?
Clearly defining sections of a video can help learners navigate it, as well as help you separate the content into chapters, which can be entered into video information and linked directly.
Think about how the colors, contrast, font types and sizes, images, etc., can influence the overall look-and-feel and the accessibility of your video.