browser compatibility for iOS8 safari

I run a small nonprofit foundation in NYC for children with a rare disease, and I write all the code for our web pages. I am not a very good coder, but I manage to hold it all together. I have run into a problem with the display of one of my web pages on ios8 safari. I have reveal modal windows on some of my web pages. For the last 12 months they have worked on all browsers, but recently the video modal windows started to function incorrectly on the new ios8 safari. Works fine on safari desktop. The problem is that the modal video windows always appear on the page by default, instead of only popping up when their link is clicked. I only have this problem for video modal windows, not for text modal windows. I need help. I know that reveal modal has been deprecated. I need to fix the reveal modal software or I need a substitute method for displaying a video modal window that will work on all browsers. The page can be found at [login to view URL]