WordPress homepage doesn't work on IPhone. Touch doesn't work.

Hi.

I have bought the Accio theme with the parallax effect and responsive feature and its one page.

I included a background video with the parallax effect.
On touch devices the video will be replaced by an normal image.
This replacment works fine on Android devices. The hole homepage works fine and the touch also working.

But on the Iphone the touch isn’t working. Just when I touch exactly in the middle of the screen, the video starts.
So I think the video is still in the background and blocks my touches.

Has anyone an idea how to fix that bug or any other idea?