Execution error

Hello

I try to compile your code on Ubuntu 20.04 and it works properly.

When I run cam.py I get that error:

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /usr/local/lib/python3.8/dist-packages/helloWorld-1.0-py3.8-linux-x86_64.egg/[helloWorld.abi3.so](http://helloworld.abi3.so/): undefined symbol: _ZN5pbcvt16fromMatToNDArrayERKN2cv3MatE
```