A
treatment is a description in clear English in the present tense
setting out what your product / film / video has in it, starting at the
beginning in the case of a video which has a linear narrative.
Other sites include http://www.wikihow.com/Write-a-Script-Treatment
and http://www.lightsfilmschool.com/articles/treatments/
Here is a sample treatment:
and http://www.lightsfilmschool.com/articles/treatments/
Here is a sample treatment: