You can find the metrics for each video in your groups media in Grytics or in the post list. Each video will appear as a single post with its interaction. For the post itself (that contains all the videos), metrics will be reflected in the posts list.
There is no detailed metrics about videos on Workplace at the moment.
On Workplace from Facebook, we do not provide this at the moment even if you export the posts list. We just have the global views with the metric “number of views” on the posts list. Please note that you have access to the post insight to have the audience of the post with the percentage of views and comments by department, location, division, organization. This will be added during H2.
On other types of communities, this information is not available.