UF's sororities all make these videos, and they're all at least this quality, and have been for years. It's pretty intense.
The videos are shown Round 3. So at that point the PNM's have already been to that house twice. Round 1 they get a general intro to the house. Round 2 is a philanthropy round (last I heard, anyway), so they already know all about that too.
Round 3 is the chapters' last chance to make an impact and emotional connection before Prefs. It would be stupid for the video to go on and on about service projects or general events. I guarantee you that the sisters featured on the video included the most outgoing girls in the house, exec members, rush chair, etc. So chances are, most PNM's sitting there will see a sister they already met on that video.
While these videos are playing, the sisters are either sitting next to the PNM's or standing behind or around them. The sororities always put stuff in about the seniors or people who aren't there anymore to get sisters crying. (I was always stationed near the front because I was known for crying "elegantly," in the words of our house mom

)
Generally, after the video, they sing a sisterhood song or someone reads a poem or something equally sentimental. Then the PNM's are led to the door. It's very emotional.
Theta's video here perfectly accomplishes everything it's supposed to accomplish. Yep, they're beautiful and outgoing girls. Have been that way forever as far as I know. Super nice, too. Gosh, it's just terrible that their video shows that! Give me a break.