In the YouTube description, the producer of the video explains the history of the footage:
About the tribute video: My name is Levan Tsikurishvili and I have been working with Tim since about 2013. During these years, we made 8 music videos, 3 concert movies and 2 documentaries together. In 2016, right after his last show, Tim, Tim’s childhood friend Awat, and I spent 19 beautiful days in Madagascar, ll Saint Marie. This video is a collection of my smartphone videos plus some parts of unused material from the documentary Avicii: True Stories and newly shot footage. I also did some 3D animations in order to recreate the moments that I did not have any video material from.