Tagging PDF document using PDFUtilityService

Hi,

I am trying out this documentation for tagging PDF.

Using AEM Document Services Programmatically | Adobe Experience Manager

For using the below code:

@Reference
private PDFUtilityService pdfutilityService;
private static final File outputFolder = new File("C:/Output/");
void tag(File inputFile) throws Exception
{
    Document inDoc = null;
    try
    {
        inDoc = new Document(inputFile);
        if(inputFile.getName().trim().isEmpty()) {
            throw new Exception("Input file name cannot be null");
        }
        String inputFileExtension = "";
        int dotIndex = inputFile.getName().lastIndexOf('.');
        if (dotIndex > 0 && dotIndex < inputFile.getName().length() - 1) {
            inputFileExtension = inputFile.getName().substring(dotIndex + 1);
        }
        if(inputFileExtension.isEmpty()) {
            throw new Exception("Input file should have an extension");
        }
        Document taggedDoc;
        taggedDoc = pdfutilityService.tag(inDoc);
        File outputFile = new File(outputFolder,"Output.pdf");
        taggedDoc.copyToFile(outputFile);
        taggedDoc.close();
    }
    finally {
        if (inDoc != null) {
            inDoc.dispose();
            inDoc = null;
        }
    }
}

Please let me know the import for PDFUtilityService.

Is this using PDFUtilityService (AEM Forms API) or is there any other PDFUtilityservice? Can anyone please help here?