I have a video from a security cam, and the video is not good enough and I can't see the number of a car, is there some software that could help me with that ?
In brief, it's not possible to extract more information from the video than is already there (the CSI effect - "ENHANCE!"). However, if the video is suffering from a particular kind of artefact (i.e. severe blockiness) then you might try some post-processing filters. Check out VLC in the first instance and experiment with its post-processing.
In Hollywood creating missing pixels is done in movies, but in real life once a pixel is gone it's gone forever.
Nevertheless, blurred movies can be visually sharpened, although this is mostly esthetical.
See also the VirtualDub MSU Smart Sharpen Filter, described as :
Here is an example of what it can do: