As noted, it's very difficult to do if you have an existing mortgage. You need the permission of the company that holds the loan to do so. Easier to add one than take one off though. If there's no loan tied to the contract, you can do it yourself for less than $50 fairly easily. All you need is a quit claim deed and the ROFR waiver which will be automatic for an immediate family member. If you want to have someone else do the work, Timeshare transfers will do it for $250 if you get the ROFR. I think the company Tom mentioned is just a little higher with their recent fee reductions but not much.
Remember that this becomes part of their property. So if they have any financial problems the entire DVC contract will be at risk. If you want someone to have benefits, add on 25 points through DVC then change JUST the small contract. If you want to pass it through in case of death, there are other ways that will be just as effective and likely safer.