It would be great if anyone can tell me the name of the tune that appears in this advertisement for Visa.
Link to the video: https://www.youtube.com/watch?v=hpF1sZkbaQs
I am inclined to agree with @Angst here. The tune seems to be a remix of the refrain (by Susmit Sen on the guitar) of the composition Desert Rain by Indian Ocean, from the album of the same name. It is common to see popular tunes being reworked into advertisements, and I'm sure this is one of those situations.
Here is a link to a performance of Desert Rain by Indian Ocean on YouTube, taken from @Angst's comment.