python demo.py zsh: segmentation fault

sorry i'm not a native english speaker, so let me describe the problem simply:

git clone --recursive https://github.com/andrewssobral/bgslibrary.git bgs
cd bgs/build
python setup.py build
> ...
[100%] Built target bgs_python
Moving built python module
python setup.py install

python setup.py install
> running install
running bdist_egg
running egg_info
creating pybgs.egg-info
writing pybgs.egg-info/PKG-INFO
writing dependency_links to pybgs.egg-info/dependency_links.txt
writing top-level names to pybgs.egg-info/top_level.txt
writing manifest file 'pybgs.egg-info/SOURCES.txt'
reading manifest file 'pybgs.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
no previously-included directories found matching 'src'
no previously-included directories found matching 'wrapper'
warning: no files found matching '*.*' under directory 'pybgs'
no previously-included directories found matching 'build'
no previously-included directories found matching 'dist'
no previously-included directories found matching 'tools'
no previously-included directories found matching 'test'
no previously-included directories found matching 'gui'
no previously-included directories found matching 'examples'
no previously-included directories found matching 'docs'
no previously-included directories found matching 'dataset'
no previously-included directories found matching 'config'
no previously-included directories found matching 'cmake-modules'
no previously-included directories found matching '_dist'
no previously-included directories found matching '_wiki'
no previously-included directories found matching '_opencv_cmake'
writing manifest file 'pybgs.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.9-x86_64/egg
running install_lib
Moving library files
running install_data
creating build/bdist.macosx-10.9-x86_64
creating build/bdist.macosx-10.9-x86_64/egg
copying build/lib.macosx-10.9-x86_64-3.7/pybgs.cpython-37m-darwin.so -> build/bdist.macosx-10.9-x86_64/egg
creating stub loader for pybgs.cpython-37m-darwin.so
byte-compiling build/bdist.macosx-10.9-x86_64/egg/pybgs.py to pybgs.cpython-37.pyc
creating build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
copying pybgs.egg-info/PKG-INFO -> build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
copying pybgs.egg-info/SOURCES.txt -> build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
copying pybgs.egg-info/dependency_links.txt -> build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
copying pybgs.egg-info/not-zip-safe -> build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
copying pybgs.egg-info/top_level.txt -> build/bdist.macosx-10.9-x86_64/egg/EGG-INFO
writing build/bdist.macosx-10.9-x86_64/egg/EGG-INFO/native_libs.txt
creating dist
creating 'dist/pybgs-3.0.0.post2-py3.7-macosx-10.9-x86_64.egg' and adding 'build/bdist.macosx-10.9-x86_64/egg' to it
removing 'build/bdist.macosx-10.9-x86_64/egg' (and everything under it)
Processing pybgs-3.0.0.post2-py3.7-macosx-10.9-x86_64.egg
creating /Users/jawei/opt/anaconda3/envs/bgs/lib/python3.7/site-packages/pybgs-3.0.0.post2-py3.7-macosx-10.9-x86_64.egg
Extracting pybgs-3.0.0.post2-py3.7-macosx-10.9-x86_64.egg to /Users/jawei/opt/anaconda3/envs/bgs/lib/python3.7/site-packages
Adding pybgs 3.0.0.post2 to easy-install.pth file
Installed /Users/jawei/opt/anaconda3/envs/bgs/lib/python3.7/site-packages/**pybgs-3.0.0.post2-py3.7-macosx-10.9-x86_64.egg**
Processing dependencies for pybgs==3.0.0.post2
Finished processing dependencies for pybgs==3.0.0.post2

after the installation finished, i run demo.py in conda py3.7, encounter a error like follow, i used three days to fix it, and i failed, can you give me some help please?
```
(bgs) jawei@jaweideMacBook-Pro bgs % python demo.py
zsh: segmentation fault python demo.py
```