The following PDF Converter for SharePoint Online videos are available:

• Video introduction to the PDF Converter for SharePoint Online.
• Video Tutorial - SharePoint Online / O365 - PDF Converter Installation
• Video Tutorial - SharePoint Online / O365 - PDF Conversion Demo
• Video Tutorial - SharePoint Online / O365 - PDF File Merge Demo
• Video Tutorial - SharePoint Online / O365 - Workflow Component Installation
• Video Tutorial - SharePoint Online / O365 - Building a simple PDF Conversion workflow

They are all short and to the point, check them out.