got the message, and can reply back that if you have heard of F.e.a.r game with a young girl in red + combinated with adult form....this character model would be amazing to paste into my own movie scenes on timeline...I tried to read through almost anything that had anything with the effect tools to do, but did not find out what tools to use

to be more detailed, then this is what is needed:
there is a game I have played several years and it is a horror first person shooter game that contains action and shooting with horror atmosphere and scenes with a young girl that is animately created where she is dressed up in a red dress and pure black hair and white skinned tone in face with dark eyes...she`s mainly a ghost, and also has adult form where she is naked but more higher and grudgy like grudge movie girls. She makes movements in the game that I want to copy and paste into my movie scenes, but I cannot remember if it was masking motion tool or pan/crop tool that was needed for this, I mainly want to use my program to let this happens.

I've done this with Q3A & Doom3. Here's how I did it.

I made a map with a green screen texture as the backdrop. I put the entity I wanted in the map, saved the map, then loaded it up in game. I then used some kind of software (whatever you want, D3 for example does this built in) to take the view of the green screened level and save it to an image sequence. Then I loaded it up in Vegas and keyed it out, then added my own footage behind it.

Here's a quick example I did almost a decade ago: http://sterlingshield.net/home/steve/vegassite/video/q3greenscreentest.mov

hey happyfriar. Do you at all have any hotmail adress where I could contacted you more directly to be able to explain you fully out what I need and want so it might can be more easer for you to help me with maybe completing my own task?

and what is the effect tools or basically effects called to make this? is it pan/cropping or motion masking?

All the hard work is going to be done in FEAR and I have no experience modding for that game.

Plus, posting it on the forums is better for everyone: someone else wanted to do something similar (basically CG composited in to video) would do the same thing.

The technical term is "compositing".

An alternative method proposed is to capture the area in the game without the wanted elements, then record the exact same motions again using the wanted elements & use the track compositing method "difference" to only show what's different in each event.

EDIT: you can also e-mail most users by clicking on their username in a thread & clicking their name.

I did not understand what you meant with capturing the area in the game without the wanted elements, and then record the exact same motions again. What do you mean I should capture with? a camera infront of the gameplay?

I had two tracks...the one at top with the reality footage from my movie, and under that...a scene from the girl in the game. But when I tried composite mode with using the method called: difference....it did not got close the effect as I wanted, because I mainly want only the girl from the game into the scenes for my footage...nothing else at all...only her and the moves she does, the editing tools makes this kind of frustrating because I cannot find even in the index what I need, and also in the way my footage are filmed...then I dont know what I should do to let it look like the character model from the game acts realistic into my scenes wich means....if I film a path straight forward....then I would let it look like the game animated girl walks on that path and not heading outside the screen and so on with different scenes, and by this I dont know how to manage or control the tools to make this stable for my project.