Thanks that could work, but I haven't unlocked developer mode for security reasons; so side-loading .apk isn't possible. Anyways, I'm quite sure it's an issue

Thanks that could work, but I haven't unlocked developer mode for security reasons; so side-loading .apk isn't possible. Anyways, I'm quite sure it's an issue on ChromeOS side. Apart from streaming like Youtube, Netflix; there seems to be no HW acceleration in default video player itself.