I don't know exactly, however here are some broad steps:
1. Read video file into MATLAB: http://www.mathworks.com/access/helpdesk/help/techdoc/ref/videoreaderclass.html
2. For each frame, use some algorithm to determine where the bird is. Does "IR" mean infrared? If so, is the bird the thing with the most intensity?
3. Store x,y bird location for each frame, then use plot function to plot the data.
Sorry for the vague answer. Hope this is what you were looking for
