As far as amateur video goes, I've only seen one black cuck. His wife was white, and he brought in a hung black guy to fuck her.
There probably are many more black cucks, but they just don't let the world know about it.
Not sure that I saw the same video. The wife is an amateur white woman who has several videos with her and a BBC alone. In one video, however, her Black husband joins them toward the end. If I remember correctly, he sucks the BBC at her direction. She seems to dominate their marriage. Her videos are quite a turn on.