Feature/live face detection webcam

[matyig]

Issue Number

ISSUE #

Describe the changes you've made

I implemented the real time face mask detection with webcam. For this I had to performed some refactoring first to get a more clear code. Furthermore, I downgraded the tensorflow to 2.3.0 for getting GPU support on Ubuntu 20.04 LTS.

Describe if there is any unusual behavior of your code(Write NA if there isn't)

The real time face mask detection is working, but it seems to be unstable.

Additional context (OPTIONAL)

Test plan (OPTIONAL)

Checklist

• My code follows the code style of this project.
• I have performed a self-review of my own code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• The title of my pull request is a short description of the requested changes.