This can be done using the CSS z-index key, which determines the stack order of the element.
The navbar bootstrap has a z-index of 1030, so in order for the bootstro backdrop to bootstro backdrop navigation bar, you need to set the z-index to a level above 1030.
eg
.bootstro-backdrop { .... z-index: 2000; }
You also need to make sure bootstrap popover not enabled, so you need to increase its z index above 2000 .
.popover { z-index:2001; }
Fiddle
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