Are there currently any services or software tools that use Google Cloud Vision as backend for OCRing scanned PDF files?
If not, how would one be able to use Google Cloud Vision to turn PDFs into OCRed PDFs? As far as I know, Cloud Vision currently supports PDF files, but it will output recognized text only as a JSON file. So it seems one would need to do the additional step of placing this converted text on top of the image inside the PDF outside of Google Cloud Vision, in a separate step.
Background:
I often have to convert scanned-document PDF files into PDF files containing an OCRed text layer. So far, I've been using Software like OCRKit or ABBYY FineReader. I tested the accuracy of these solutions against the text recognition abilities of Google Cloud Vision, and the latter came out far ahead.