ramblings

With   PyMuPDF and tesserocr you can OCR image pdf easily

Many office machines creates pdf as result of scan instead of  image. Unfortunately not always they includes also text layer for copy&paste or they include text layer based on default language of scanner and not document language. In such cases you can use  tesseract to crete "searchable pdf".

Do you need to OCR OpenCV image? No problem with tesseract.

If you search for efficient solution of using tesseract OCR in python you will need to use tessocer. But there are no recent version of project for current version of python on windows. So you have build it by yourself.