"To measure end-to-end delay you need to point the video camera at a stopwatch (digital or analog, doesn't matter) and then take a photograph that captures both the stopwatch and the far-end on-screen reproduction of the stopwatch. You won't be able to judge delay by eye, unless it gets really big and annoying."
  – Mitchell Trott

That's an interesting low-tech solution to the surprisingly difficult problem of measuring video delay.