Linux
1. install Go1 and OpenCV
2. go get code.google.com/p/go-opencv/trunk/opencv
3. cd ${GoOpenCVRoot}/trunk/samples && go run hellocv.go

Windows
1. install Go1 and MinGW
2. install OpenCV-2.4.x to MinGW dir 
   libopencv*.dll --> ${MinGWRoot}\bin
   libopencv*.lib --> ${MinGWRoot}\lib
   include\opencv --> ${MinGWRoot}\include\opencv
   include\opencv2 --> ${MinGWRoot}\include\opencv2
2. go get code.google.com/p/go-opencv/trunk/opencv
3. cd ${GoOpenCVRoot}/trunk/samples && go run hellocv.go