The conditions were just about perfect this morning to try capturing the ISS in video mode on the Nikon D300s.
I set up in one of my dark sky locations in Marlborough, Ct. that had a good WSW view of where the ISS was going to appear at 6:07 am. The sky was starting to brighten just enough to give some good contrast against the ISS at magnitude -2.5 as the Heavens Above website mentioned.
About one minute later than predicted the ISS came into view as it sped across into the southern sky.
Here is a 15 second video out of 2 minutes that I captured on the Nikon D300s camera with a 85mm lens.
Below is the ground track for the ISS this morning courtesy of Heavens-Above.