Merge pull request #11743 from alalek:samples_avoid_double_VideoCapture_open
authorVadim Pisarevsky <vadim.pisarevsky@gmail.com>
Mon, 25 Jun 2018 12:54:09 +0000 (12:54 +0000)
committerVadim Pisarevsky <vadim.pisarevsky@gmail.com>
Mon, 25 Jun 2018 12:54:09 +0000 (12:54 +0000)

Trivial merge