It is a fully Customizable PowerPoint file to create Birthday video greetings card to send digitally. Open the file in MS PowerPoint (Best version - Office 2019/ Office 365 or later), replace (the text, image, music etc.) as per your requirement. Home -> Select -> Select pane will help you to hide and unhide the objects for ease of customization.  Save/ export as mp4 file. Great, you are done.
 
To compress the file size, you can convert the type to .mov through third party application.