Just curious if it is possible to get malware through a trusted site hosting an HTML 5 player.
I would imagine since Chrome is in a sandbox, nothing download to your computer?
There are no known public sandbox escapes for the latest version of Chrome so this would require a Chrome 0-day. This means that while it is not impossible it is very unlikely that a particular person has that knowledge.
Also note that such an exploit would possibly be worth quite a lot in the right context and thus unlikely to be widely spread or used on any low-value target.