Hello Sangisetti,
There is possibility for extracting the invoice number/ sales order from hand written documents into any format using OCR/ICC. But it is not a built in solution that shipped along with xECM and may need custom development.
I think, you can trigger a background job or event for n/w watch folder but still it depends on your requirement. I doubt if xECM supports it.
But these features are more supported in SAP - VIM solution.
Feel free to communicate if need any more info.
Thanks,
Kolusu