CARACAS, April 30 (Reuters) - Venezuelan opposition leader Juan Guaido said on Tuesday he had began the "final phase" of his plan to oust President Nicolas Maduro, calling on Venezuelans and the military to back him to end Maduro's "usurpation."

Guaido, in a video posted on his Twitter account, was speaking in the company of men in military uniform and opposition politician Leopoldo Lopez, who is under house arrest. He said he was at the Caracas air base La Carlota.

"The national armed forces have taken the correct decision, and they count on the support of the Venezuelan people," Guaido said. (Reporting by Angus Berwick Editing by Peter Graff)