Two methods are available for converting a powerpoint to youtube video:

Method A:
1.Save your PowerPoint slides as images like jpg or png in Mirosoft PowerPoint
2.Import these pictures into Windows Movie Maker and make a video.

Method B:
Record Powerpoint presentation from screen using screen video capture software

Method C:
Use a PowerPoint to video converter to convert your powerpoint file to video format directly.



Notice: All your PowerPoint original elements like animations,transitions, video clips and sounds will be removed when you save your powerpoint slides as images using Method A.