Minor fix for Web Cam on OpenCV 3.x

AlexeyAB

2018-04-06 1b1221ace5f49b5b464cf7f4ff89f31cf03d3da1

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aeroplane
bicycle
bird
boat
bottle
bus
car
cat
chair
cow
diningtable
dog
horse
motorbike
person
pottedplant
sheep
sofa
train
tvmonitor