$ go get -u -d gocv.io/x/gocv
$ cd $GOPATH/src/gocv.io/x/gocv
$ make install
# serve the default webcam /dev/video0
$ go run main.go
# serve an ip camera stream
$ go run main.go rstp://camera_ip:554/
# serve another a usb camera
$ go run main.go /dev/video1