The formats include:
the 728×90 Leaderboard
the 120×600 Skyscraper, and
the 160×600 Wide Skyscraper.
This is in contrast to the earlier format where video could be used on 300×250 Medium Rectangle, the 336×280 Large Rectangle, the 200×200 Small Square, and the 250×250 Square.
For more read "Introducing video ads".