Coverr is a resource for FREE stock videos, no catch! No registration required. Coverrs are videos that are made to fit as a beautiful video background but you can use them for any need, including for commercial and noncommercial use.
DreamyPixel is a collection of over 200 free landscape images. Free to use for personal and commercial use.
Stokhub is a stock video site offering users unlimited stock video for $25 a month. More than 5000 5K, 4K stock video clips, with more than a 1000 clips being added by producers a month it is the most affordable source for high quality video content.
Free Facebook Cover Videos by Pexels is a curated library of free Pexels videos.
Perfect for your Facebook page cover.