Pexels Videos - Find free stock footage for Chroma key (green screen) backgrounds

Web Address: https://videos.pexels.com/

In their own words: "Pexels Videos offers completely free videos. All videos are licensed under the Creative Commons Zero (CC0) license. This means you can edit or change the videos and use them free for personal and even for commercial projects. All without asking for permission or setting a link to the source. So that attribution is not required. With our swiftly growing database of videos, you are guaranteed to find the perfect footage for your website header, product promotion, or anything else. Every video we have available is free for any purpose - including commercial. This guarantees that you will be saving the hundreds of dollars better spent promoting your brand."