Install dependencies with Homebrew:
brew install libusb pkg-config
brew install home
brew/core/glfw3
brew install cmake
brew install librealsense
Then build the librealsense library from source:
git clone https://github.com/IntelRealSense/librealsense
cd librealsense
mkdir build
cd build
cmake ../ -DBUILD_PYTHON_BINDINGS=TRUE
make -j4
sudo make install #Optional if you want the library to be installed in your system
Copy the .so files in the folder librealsense/build/wrappers/python/ into the site-packages folder.