There is nothing simple about it!
Please see my past answers with references to several works, mostly on CodeProject:
Apply online handwriting on neural network
You can also review some well-known OCR products, those which are Open-Source:
The problem with most or all of those Open-Source works is: their authors are maybe strong in applied mathematics, but form what I saw it looks like most of all of them have no idea on general programming. Maybe that's why I failed to find anything working correctly with Unicode. CodeProject articles I referenced above are much better, but are incomplete. You would need to do serious work to complete them into a product. However, most difficult job is already done.