I found a Video where 3D Artists created a 3D Visualization and im wondering how they did that it seems they created a Video Footage and added 3D Objects into the Video (Houses, Trees etc.) Can anybody explain me how this works?
This is standard stuff. It's known as camera tracking. Here is something in blender that can get you introduced to the subject. Almost every fx software/video editing software has this built in. Sometimes it is called Match Moving apparently from this wiki article but I've never heard it called that. https://en.wikipedia.org/wiki/Match_moving
This kind of thing is like CG/VFX 101. I see you are new here so first welcome to Polycount. It goes a long way here to do some research before posting questions. Saves you some time and saves from accumulating snarky comments. Check out the stickys at the top of this section. Particularly these two.
But anyway if there is something that you aren't picking up from those resources or the research you've done of course feel free to post your questions. Try to make them specifically about what you wondering. Camera tracking is a very general and wide spanning area to inquire about.
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But anyway if there is something that you aren't picking up from those resources or the research you've done of course feel free to post your questions. Try to make them specifically about what you wondering. Camera tracking is a very general and wide spanning area to inquire about.