There is FGestureRecognizer which detects gestures as part of the PlayerInput Tick and it (in theory) will identify 6 gestures and submit them as an FKey that you can bind anywhere you can normally bind a key (Action Mapping, On Key). However, it is admittedly not in great shape at the moment and I believe that several of the gestures are not even detecting properly :(. It is also not extensible which I think is probably necessary. It is in the backlog to clean up and get working better, but if you were looking at investing some time on gestures in the near term and wanted to use it as a starting point it might be something that would be able to be integrated back in to the engine via pull request.