报错如下：
qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.这个问题似乎与版本有关，特别是opencv -python to 4.2.0.32
解决办法 安装较低版本的oepncv-python
pip3 install opencv-python==4.1.2.30