This problem has been caused by changes made by both Google and PowerPoint and only affects video added to the presentation as embedded code. Videos which are accessed via a Hyperlink or Shockwave Objects will continue to work in Office 2013 (Shockwave Objects will only be displayed as a white square with a cross until the presentation is run).
A black square will show instead of the video.
You can create a Hyperlink to jump out of PowerPoint into Internet Explorer and run the video there (single click from slide show). This is recommended as being more future proof and can be done in both Office 2010 and 2013 although is not as slick. Alternatively you can use Microsoft's direct replacement and add it again as a YouTube item using PowerPoint 2013.
Recreating the link – as a Hyperlink (PowerPoint 2010 or 2013*)
NB: These videos will play in Reading View or when playing the presentation, but not whilst editing.
NB: These videos will play in Edit/Normal view, Reading View or when playing the presentation
*If you do not already have office 2013 on your staff PC this is available for self-install. Before upgrading please consult the How do I upgrade to Office 2013 FAQ 2682 regarding differences/impact of upgrading. Installing software on IT Services Staff desktop. Staff can obtain Office 2013 for their own machines.
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This is question number 2680, which appears in the following categories: