You can try this bookmarklet :
Add it to your Favorites Bar and click on it when a video is on the page.
Unfortunately I can't check this cuz I don't have Chromecast .
More info : https://vidcast.dabble.me/
Extension is now available in Maxthon Extension Center - http://extension.maxthon.com/detail/index.php?view_id=2947
Please download this updated version.
Extension is now available in Maxthon Extension Center - http://extension.maxthon.com/detail/index.php?view_id=2945
Please download this updated version.
Extension is now available in Maxthon Extension Center - http://extension.maxthon.com/detail/index.php?view_id=2946 .
Please download this updated version.