Run the following command:
conda install -c https://conda.binstar.org/menpo opencv
I realized that opencv3 is also available now, run the following command:
conda install -c https://conda.binstar.org/menpo opencv3
Edit on Aug 18, 2016:
You may like to add the "menpo" channel permanently by:
conda config --add channels menpo
And then opencv can be installed by:
conda install opencv(or opencv3)
Edit on Aug 14, 2017:
"clinicalgraphics" channel provides relatively newer vtk version for very recent python3
conda install -c clinicalgraphics vtk