Z-index issue in Safari. How to get rid?

Question

YouTube

Hello! The problem is here: baby-curls.ru/#reviews and is only visible in Safari.
All videos in the slider (except the first one) are not active. Apparently, the conflict arises because of the bootstrap, which uses in its styles - webkit-transform: translate3d(100%, 0, 0);
In general, I experimented with z-index directly in the iframe tag, as well as in the parent (position: relative is).
Also in the same tags I wrote -webkit-transform: translate3d(0, 0, 0);
And of course, adding &wmode=transparent
to the video address does NOTHING help. Their thoughts and advice from Google no longer give any sense. All one by one. Help out!...

Answer 1

Tried in Safari 5, everything works. Only with a slight delay.