Is it possible to change default html5 video player\'s colors or complete skin?
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Thing is that media control styles are only available deep into shadow dom. There is a list here: https://gist.github.com/afabbro/3759334
Look at the main thread and the comments as well. They are keeping these more or less up to date. I mean, maybe it'll have a good use for you, maybe not, but it's nice to know that there is some level of support to this kind of styling.
Pay attention that you may inspect shadow DOM on your browser to see classes added into the shadow elements, but you can edit just the ones prefixed with "-webkit"