Some thoughts based on looking at the video a few times more (disclaimer - I'm not a video professional)

* There needs to be some variation in the zooming if you use this in a slideshow. I'd even say bias it towards zooming out more often, since that gradually reveals more of the image.

* You might have enough information to work with here to develop a similar "focus pull effect from single image" algo. That would be really cool.

* Maybe also you could try to develop a "sunset fade" for images where you detect blue sky. Graduallu adding a gradient yellow-orange fade for the sky, gradually warmer and darker foreground and non-sky background.