You still have to plot out a storyline, script it, employ people to act it, employ people to clothe and cosmetic the actors, provide the props, and to arrange lighting and cameras. You might have to take out a loan to pay for those people and the props/costumes/use of buildings, etc. for the setting.
Maybe you don't need a lot of people, clothes, etc., but you certainly need a story. Write that story. Then see if it works better as a book or a script.