Keep residual image of an element in a video
You'll need to separate the spider from the background somehow. Then you can stack successive images of the spider on top of the initial background, and the previous spider image frames.
here's an ascii art representation
        sp5-------------&gt;
      sp4---------------&gt;
    sp3-----------------&gt;
  sp2-------------------&gt;
sp1---------------------&gt;
bg----------------------&gt;

So on the first frame we see the BG with the first Spider frame composited above it. This frame is held, then on the next frame we add spider frame 2 and hold, then on the next spider frame 3 is added, and so on.
How you actually achieve this depends on the software you're using.