It's rare to find pacing videos of trains. By pacing videos I mean shots where the train and the observer are moving side by side. You need two things: a road parallel to the tracks with few obstructions in between, and a driver. I haven't shot any pacing videos because I usually railfan alone.
Caleb aka CNCRW94 posted a video of local CN 507 rolling through Windsor Junction. He chased it and provided some pacing footage as shiny CN 4805 and grimy CN 4725 pulled a few hoppers and tankers along.
Dave aka nbsrfan has long been a practitioner of the pacing shot. Here is his video of a recent NB Southern Railway passenger train, with a nice pacing sequence through Westfield at 4:02 and 4:27 and 5:09.
Nice job, guys!