Experts say that there are almost 200 uncontacted groups which exist around the world, with a large chunk based in the Amazon rainforest spanning across Brazil and Peru.
The Mashco Piro people are thought to be one of the largest uncontacted tribes, and their land is under threat from logging.
Rosolie, who has spent nearly two decades working in the Amazon rainforest, said the moment captured in the footage was among the most powerful experiences of his life.
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