i am newbie here whated to know how to insert text on video and by which software to use ???
By insert text on video, do you mean adding comments to individual frames, adding an introduction screen, captioning???
Google for SSA and use Avisynth or VirtualDub + VSFilter/TextSub if you want to position text anywhere you want and/or having it moving or wise you can just open up any SRT-file and look at the syntax.