ShinyStat™ Video Analytics - Metrics - Percentage of video completion

How can I figure out how many people viewed my video in its entirety?
What is the meaning of  "Percentage of video completion"  in the metrics reports provided by ShinyStat™ Video Analytics?

The "Percentage of video completion" shows the relationship between the number of "Absolute unique visitors" and "Absolute unique visitors that completed the video".
Percentage of video completion =  Absolute unique visitors/Absolute unique visitors that completed the video

An "Absolute unique visitor that completed the video" is somebody who, when s/he viewed the video for the first time, viewed at least 90 percent of the video.

The data provides you with an estimate of how many visitors have viewed at least 90 percent of the video.