In letters to British Prime Minister Theresa May and Bank of England Governor Mark Carney, Guaido said Maduro government officials were seeking to sell the gold and move the proceeds to Venezuela's central bank.
The video triggered a Twitter trend under the tag #guaidochallenge, with users posting photos of themselves, friends and even pets wearing caps and hoodies to show that it could have been anyone in the footage.
The diplomatic friction and defection was triggered by US recognition of opposition leader Juan Guaido as Venezuela's interim president. Washington, Canada and most Latin American nations said Maduro's second-term election win was fraudulent.
Venezuela has sunk into turmoil under Maduro with food shortages and daily protests amid an economic and political crisis that has sparked mass emigration and inflation that is seen rising to 10 million percent this year.