The video shows a 'banner cloud' - not common in the UK but a classic on the Matterhorn. The air blowing right to left is deflected up over the island and air pressure becomes lower on the leeward side. This in turn allows air to rise on the leeward side, and if conditions are right, cools and forms
the cloud. This cloud (like a flag - hence known as a banner cloud)
streams out until the process decays down wind. The time lapse shows the process particularly around the 9 second mark.
Sometimes you see a similar effect when fast jets take off and 'cloud'
forms temporarily on the rear edge of the wings.

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