Overlay color can be set for normal and hovered video.
The setting can be found under Style ( tab ) > Content.
Overlay Color will display on normal video. While Overlay Hover Color color will display when you hover over a video.
Related Documents –
How to Set a Custom Placeholder Image for the Video?
How to Set Overlay Color on the Video Thumbnail on Mouse Hover?
How to Set Overlay Color on the Video Thumbnail on Mouse Hover?