YouTube have started with fact-checking in its search results. It is seen to roll out text prompts which are known as "information panels" which provide fact checks when users search certain terms or phrases. It is rolled out to a limited number of users in India.
YouTube is not blocking the video results or actual videos regarding hoaxes. It is only serving additional fact-checked information from publishing partners to its users.
Fact checks are said to appear on terms based on the content available from YouTube's partners regarding that particular search query.