You don't need a video. You need marketing & communication 101. During covid I am sure some professors uploaded lectures to youtube, or pick up the book if it's more your jam. Think about what you want to communicate to a person coming across your project for the first time. Make bullet points and rank them. Then begin writing including all the information in that order.

A good readme would be sufficient. Go to some popular project and copy their structure of its readme in your project.