Hi @sapphire240400 ,
if you wanted to embed a running video directly in the article details page, you would have to edit the article_details.tpl template - however, I recommend against doing so.
The Journal für Psychoanalyse issue with the video content has HTML galleys which include an iframe or several iframes that loads the Vimeo videos. For this, the HTML galley plugin needs to be enabled. We use a special plugin that also displays the header and footer of the journal. See https://www.psychoanalyse-journal.ch/issue/view/172 for whole issue and https://www.psychoanalyse-journal.ch/article/view/jfp.59.5/939 for an example (there, you can inspect the HTML code using your browser’s Web inspector).
In addition, we uploaded the videos as supplementary material so that they are archived within OJS, see e.g. https://doi.org/10.18754/jfp.59.5 .