Seed donors are people who give at the very start of your campaign.

Remember, not everyone you ask to give will give, so even a modest crowdfunding campaign aiming to raise a few thousand dollars requires getting in front of thousands of people.
Unless you’re famous in your own right or have strong social influence, it’s unlikely you’ve got immediate access to a network of this size. Here’s where PR comes to the party.

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.