Github user rakatyal commented on the pull request: https://github.com/apache/cordova-plugin-camera/pull/140#issuecomment-157873674 The button should appear on top of the video element hence we need the higher z-index value. We can keep the same z-index values same as well since the convention is that the element added later overlaps the earlier one if the z-index values are same which in this case will hold as we are adding the video element before the buttons. But this helps for understanding purposes and I assume this was the reason for the earlier values(999 and 1000) as well.
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