A campaign video is key to connecting with your crowd. People want to join you on your journey. The reason that people donate is that they want to engage with you and what you are doing. It really helps, when they can see the real people behind the scenes.

Crowdfunding is the art of rallying your community to fund your project. 

A stretch goal is an extension of your target, where you specify the extra funds required to get your art to the next level.