Gerald Haslhofer 
Options:
UWP API
https://medium.com/@rkttu/using-windows-10-built-in-ocr-with-c-b5ca8665a14e
Tesseract
dotnet add package Tesseract –version 4.1.0-beta1
Tesseract documentation: https://tesseract.patagames.com/help/html/T_Patagames_Ocr_Enums_PageSegMode.htm
Face identification
ONNX runtime and models?
https://docs.microsoft.com/en-us/dotnet/machine-learning/tutorials/object-detection-onnx
Or use UWP APIs? Call UWP APIs from DotNet Core: https://robertwray.co.uk/blog/using-windows-10-uwp-apis-from-a-net-core-application