Those are native Sami people with the reindeer. For over 1000 years some of them lived a nomadic life following the wandering caribou herds. Nowadays, they herd and breed them more than follow them.
this fascinating and innovative documentary tells all about it - but you really have to be into slow and very leisurely TV watching to enjoy this! Much better in an HD download on the big screen with the sound cranked up:
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from the BBC:
In a Slow TV Christmas special, BBC Four rigs a traditional reindeer sleigh with a fixed camera for a magical journey across the frozen wilderness of the Arctic. Following the path of an ancient postal route, the ride captures the traditional world of the Sami people who are indigenous to northern Scandinavia and for whom reindeer herding remains a way of life.
Filmed in Karasjok, Norway - 200 miles north of the Arctic Circle - this journey takes us through breathtaking scenery not normally glimpsed by anyone other than the Sami. Deliberately unhurried, the rhythmic pace of the reindeer guides us along an epic two-hour trip that takes us over undulating snowy hills, through birch forests, across a frozen lake and past traditional Sami settlements.
Facts about the reindeer, natural history, Sami culture and the Arctic climate are delivered by graphics and archive stills embedded into the passing landscape. With no commentary, music or presenter - just the crunching of snow and the soft tinkle of a reindeer bell - this hypnotic sleigh ride is an enchanting experience to put everyone in the Christmas spirit.