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This is a new feature still in beta that was just added to Chromecast, or perhaps it be more proper to say it was just added to some Android devices. Unless you have a top tier or Nexus device from Samsung, HTC or LG, you can’t do this...yet. If you have have a 4.4.2+ device, this feature will probably be added for it in the future. If you happen to have one of the currently supported devices (S4, S5, Note 3, Note 10, Nexus 4, Nexus 5, Nexus 7, Nexus 10, HTC One M7, LG G2 or G3) go to Google Play and download the Chromecast App, open it, select “cast screen” from the navigation drawer, then sit back and play Candy Crush on the big screen.
More info from Google: https://support.google.com/chromecast/answer/6059461