Follow the preliminary steps to load the videos and DLT coefficients as detailed on the digitizing instructions page.
On the dataviewer controls, click the load data button. You will be prompted to select a .csv file of the format *xypts.csv. This contains previously digitized data and will load the appropriate number of points and will apply the digitized data to the videos.
A warning will appear that you should check the offset values. As long as these are still set to zero and you have not adjusted them when digitizing, you can ignore this warning.