Using custom camera in OpenCV (via GStreamer)

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Looks like we can call the camera using a proper GStreamer pipeline like below:

VideoCapture cap("mfw_v4lsrc ! ffmpegcolorspace ! video/x-raw-rgb ! appsink")

as the camera output is in YUV, we need to convert that to RGB to pass the frames to OpenCV.
This is where OpenCV makes sure it gets RGB colorspace.

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