Position fixed and background-position fixed conflict in Opera, why?

Question

css

In general, the humor is as follows: I have two fixed backgrounds on the one-page, one in khedar - the usual card is set like this:

.head-section {
  background:transparent url('../images/head-background.jpg') no-repeat top center fixed;
  background-size: cover;
  width: 100%;
  height: 100%;
}

second, the video background is placed via html in the middle of the page, with these styles:

.quotes-Section {
  width: 100%;
  height: 100%;

  .bg-video {
    position: fixed;
    right: 0;
    bottom: 0;
    width: auto;
    height: auto;
    min-width: 100%;
    min-height: 100%;
    z-index: -999;
  }
}

Attention question: What hrn, in Opera, the picture in hedar behaves like a static and not like a fixed one?
What I tried : adding position relat and static to the head, does not heal!
Heals : if in body add:
backface-visibility: hidden;
-webkit-transform: translate3d(0px, 0px, 0px);
but at the same time, the second video backgrd is irretrievably gone!
someone knows, please help)