I confess I did not know of such a thing. From Wikipedia:

"In American football, if what would normally be a safety is scored on an extra point or two-point conversion attempt, one point is awarded to the scoring team. This is commonly known as a conversion safety or one-point safety and it can be scored by the offense. There are at least two known occurrences of the conversion safety in Division I college football – a November 26, 2004 game in which Texas scored against Texas A&M, and the 2013 Fiesta Bowl in which Oregon scored against Kansas State. In both games, the PAT kick was blocked, recovered by the defense, and then fumbled or thrown back into the end zone. Coincidentally, play-by-play commentator Brad Nessler called both of these games."

These 2 instances are the first 2 items on this video. In the Texas discussion, the video director mistakenly shows an earlier blocked punt while the conversion discussion is ongoing. Don't get confused, just ignore it. It's all about the blocked PAT.