Problem with WP Press theme full size video display on iPad

I am using the Invicitus WordPress theme ([login to view URL]) on my website ([login to view URL]). It has been heavily customised so I cannot be easily upgraded to the latest version of the theme. The homepage of the website plays Youtube videos in full screen. This works fine on a normal PC but does not work on mobile devices (tested on iPad) and comes up with the error "This video is not available on mobile devices!". This is nothing to do with the setting of the video in Youtube but an issue with the theme. The error message is contained within one of the theme files (/invictus/includes/[login to view URL]). The latest version of the theme does not have the error text in it and full screen video displays without issue on iPads. I've tried replacing just the above file but this breaks the website. I basically need someone to go through and check what the code is doing and merge the existing and the old file, and check any other files that might be preventing the video from displaying on iPads. I attach the theme changelog, I have also have a copy of the latest version of the theme. It would be recommended that bidders have an iPad to be able to test the problem as I don't believe the issue exists on emulators. Happy bidding.