At this time Collaaj does not have the capability to support a video embedded in a PowerPoint presentation.
In general, screen recording a video will work, but even then it is not a good idea as there will be frame drops. It would be best if you can upload the embedded video to Collaaj and reference it (play that video on another tab in the browser).
We appreciate your feedback and invite you to let us know if this feature is important to you. Thanks!