If you deleted the video BEFORE cops got hold of the IP that was used to upload the video there is no way to find that IP, unless they work with YT ans such...cops will most probably smile and tll that person to let go...
Also the account you used to upload the video is the real threat, not the IP!
YT account =>Gmail account=>Ip address used ot register, PVA,recovery email..
These things are all connected.
BUT...AS i said....that was a pice of nothing for the cops to get through all the trouble to appeal to YT to find your real name and address!
Unless you're a spy or terrorist! Ha-Ha
) ITs all deactivated now