If you already use adsense video units on your websites, Google will be completely withdrawing this service by the end of April so you have till then to change to the TEXT format
For newbies to adsense, no worries, the option for video ads just will not be available to you.
Not a surprise though that Google is withdrawing this ad format. Any one who has been into adsense publishing for any period of time will confirm that the conversions of the video units are poor at best.
Makes sense really for Google to discontinue the video ad units. If it's not making money for us the adsense publishers, then probably Google are not getting a lot of income from them either
message again is convert your adsense ads display format to Text format by the end of April if you are monetising your websites with adsense