The man was part of an indigenous tribe of six in the Amazonian state of Rondonia, Brazil, who were wiped out in 1995 by unscrupulous farmers who stole their land.
The man fled and is said to have lived there alone for the last 22 years.
He became known as the “indigenous man in the hole”, after anthropologists first spotted the man in the jungle in 1996, and his face was filmed in 1998 as part of documentary film Corumbria.
He has not been seen since.
In the video, the man is seen felling a tree, near his homemade hut which is built from trees.
The man, who is thought to spend his time hunting bids, monkeys and forest pigs, is estimated to be aged in his 50s.
The area in which he lives, surrounded by plantations, is 8,070 hectares in size and is surrounded by ranches.
Funai, Brazil’s governmental agency for indigenous affairs, has strict rules that limit interaction with isolated tribesmen.
This means that they do not know what his real name is or that of his original group.
Nonprofit group Survival International dubbed the man “extraordinary” for living in the area undisturbed – with the threat of land poachers still a daily reality for the indigenous survivor.
The group have helped the man, by expanding his land and laying down advanced, handmade weapons for him to use.
They placed axes, machetes and seeds traditionally planted by indigenous people for the man to find and assisted Funai is helping to preserve the isolated man’s way of life.
Survival International spokeswoman Fiona Watson said: “Funai has a duty to show that he is well and alive. The crucial thing is Funai has managed to keep his territory.
“The fact he is still alive gives you hope. He is the ultimate symbol, if you like.
“The irony is we are finding out there are more of these isolated people than we thought.
“But it’s also worrying that their cover is being blown.”