Hi! I'm a experimented video editor, I can edit your videos that you have, I can take off the black bars and put the same a blurred video in the backgroud so the photos can be as the original without crops, but the format for square videos in Facebook are 1080x1080, but if you wanna keep you videos in 1920x1080 we can work with that, I hope to work with you, Greetings!