Screenshots may not be the same you see by using ENBSeries, that's because of different versions of mod, implemented effects and their algorithms, presets.
Videos are also mostly work in progress and differ.

Users screenshots:

You can see much more screenshots on the forum and other resources, for example gtaforums.com have several threads with screenshots. I'll try to add best screenshots imho on the site.

GTA 4
GTA San Andreas

Videos:

Many of my videos have poor quality, because encoded improperly and recorded at low resolution. Actual frame rate is much higher than on videos, this perhaps because of recording software. Search for videos from other users on YouTube, they in most cases better and captured with configured presets.
Music to my videos may not fit your taste, but i don't care, as you don't care about mine.

TES Skyrim:
video
video
video
video
TES Oblivion:
video
GTA 4:
video
video
video
video
video
video
video
video
video
video
video
video
video
video
video
video
Burnout Paradise:
video
video
Richard Burns Rally:
video
video
GTA San Andreas:
video