Defensive backs often get them from interceptions but it's possible for other players have forced fumbles, strips and blocked kicks.
Looking at stats from the 2013...
Richard Sherman had 8 interceptions.
The leader in fumbles recovered was Mychal Kendricks with 4.
The leader in forced fumbles was Robert Mathis with 10.
It is tough to track because interceptions are a turnover, where forced fumbles may not be a turnover. I cannot find stats on individual turnovers created. There are team turnover differentials, but not stats for an individual (or position).
I would conclude that defensive backs, and more specifically corner backs create the most turnovers based on the stats available. Especially in today's NFL which is a passing league.
I do not have hard research to support this, however in my experience Quarterbacks have the most fumbles on any given team – generally speaking. Not the least factor in that is they touch the ball more than any other player.
Given that, I believe Defensive Ends are ”most likely to create turnovers in football”. [My college philosophy/logic professor is doing a facepalm.]
Probably by far and away; if someone were to ferret out the proper statistics. However – and of note – big cornerbacks (like the almighty Ronnie Lott) often have the most dramatic turnovers through interceptions and big hits across the middle; and those are the ones that imprint the largest in our minds – but I believe the numbers will flush out that the Defensive End is the correct answer [...unsung workhorse and most beautiful specimen of all Football players.]
(Note: It would be prudent to make sure the 2 corners and 2 safety positions are not combined into “backs” for comparison - as 4 players on a team just might collect more numbers than 2 defensive ends – and diggers3's excellently made point about forced fumbles not all being turnovers notwithstanding.)