It exists 2 versions of the player, Carbon and Black. Depending on the background color of your site, use the player color that creates the most adapted contrast.

If you haven't brought your personnal touch on your video player yet, go in MANAGEMENT > Settings > Video. The carbon player is the one selected by default.

You can also choose the progression bar color (which is the related button color too). You're proposed blue by default.

The quick color range suggets 12 colors (you might recognize this color range as it's the one you use to color your tags)

If you don't find the color your want in the range, you can type directly the desired color hexa code.