Therefore adding video content to your site is not a ranking factor.
Are you tracking other metrics, like time on site and pages per visit and conversion rate? Any increases there? If google is supposedly measuring social interaction, and those metrics improve, then maybe having the videos will eventually help?
Have you tried posting a transcription / narrative of the video as well?
Can people comment about the videos the way they can on youtube?
Lack of movement doesn't mean it isn't a ranking factor (and I'm not saying it IS a ranking factor); it could be that the gap between your site and the site above is greater than any improvement gained from the videos.