Oh, my, I seem to have really messed this up! First, I interpreted time lapse as slow motion and then showed you a slow motion video from my phone (the iPad does not even have slow motion as a stock option!). My humble apologies for confusing the issue.
So, let me start again.
And, unfortunately, the answer is that you can't fix the video. When time lapse photography is done, the camera is actually taking a series of pictures based on a set time interval. So, there are blank spaces as the camera is not constantly recording as in a video.
As there are no pictures in between each shot you do have, there is no way to smooth out the playback. It will remain jerky. Time lapse video is really just a fast slide show; the camera shutter is not open and recording all the time.
Sorry, but there's nothing to do.
Marilyn