To create a GIF from a YouTube video of your choosing, all you have to do is type "GIF" in front of "youtube" in the web address of the Youtube video you're choosing, press "enter," and TADA!, you are brought to an editing page to create your GIF. I have attached mine of Owl Jolson and his family below.
GIF of Owl Jolson and his family singing and dancing to "I Love to Singa."
Merrie Melodies animated cartoon "I Love to Singa." Directed by Tex Avery and produced by Leon Schlesinger. Originally released in 1936 by Warner Bros. and Vitaphone.