From the YouTube description:
Did Emperor Constantine have anything to do with putting in four Gospels (Matthew, Mark, Luke and John) in the New Testament? Many skeptics think the church supressed “gospels” outside of the New Testament, so they won’t be in the canon of scripture. But is this true? Mike Licona explores this “Da Vinci Code” like conspiracy.
This presentation includes information-rich powerpoint slides.
This YouTube video lasts 5:09.