opencv_trail_effect.cpp: hardcode V4L2 VideoCapture backend on linux
authorAntonio Ospite <ao2@ao2.it>
Sat, 10 Oct 2020 19:57:45 +0000 (21:57 +0200)
committerAntonio Ospite <ao2@ao2.it>
Sat, 10 Oct 2020 20:12:05 +0000 (22:12 +0200)
Hardcode the V4L2 backend on linux for now because the GStreamer one
lacks some functionality, see:
https://github.com/opencv/opencv/issues/18562


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