I cloned OpenCV using:
git clone https://github.com/Itseez/opencv.git
Now I want to know where is downloaded in order to unpack it. All what I know is: dpkg -L git
leads me to this directory: /usr/lib/
When you've started the clone command you should have get this message:
git clone https://github.com/Itseez/opencv.git
Cloning into 'opencv'...
You should find the OpenCV source in a folder named just opencv
where you launched the git clone
command.