The PreZent app is a new powerful presentation tool that allows ... you to combine multiple mediums in a seamless digital presentation... What sets apart the present app is the ability to ad motion/video throughout the presentation in juxtaposition with still imagery to allow for a very fluid presentation. There is no play button. The video plays automatically as soon as the page has turned. This allows for an uninterrupted presentation...
Via Baiba Svenca
If you have PD funds to spend on apps (my school does), then you may want to consider this one.
Likke the Auto Play feature!
Here is another app for designing presentations. The comments/reviews sound like it might be worth the small cost to for use.