Any Better Slideshow?

Sorry if this is in the wrong forum but this is what looked closest to my issue.

I will be mounting my iPad to the wall in the portrait orientation for a photo exhibition and will have a slideshow playing.

Most of my photos are portrait orientation but about 1/4 of them are landscape orientation. The landscape photos will not look great becasue they won't fill the screen.

I think the best way to show the landscape photos is to show them zoomed-in to fill the screen and pan left to right. Are there any apps that'll do this?