Six videos have been released in conjunction with the Vatican’s colloquium on complementarity—an event being held now in Rome. I have not yet seen all six, but I have viewed the first one (see above). It is really well done. In fact, I would say that this is a must-watch video. It bears an international, timeless perspective on the fundamental “complementarity” of marriage—that is, that marriage is fundamentally a heterosexual union. It includes testimonials from N. T. Wright, Peter Kreeft, and many others.
I think that this video is expressing what Pope Francis himself declared today in his opening remarks to the colloquium. In a translation provided by the Vatican News website, the Pope affirms that marriage is irreducibly heterosexual in its nature. You can read his remarks here.