Large Map

thank you

Yes, this can be done without any problems. 

Any scene background that is larger than your default game resolution will automatically turn that scene into a scrolling scene & the camera will follow around the playable character as they move around the scene.

There are some limitations as to how large you can make your scene backgrounds, but it's highly unlikely that you will be making any scenes that large.

again thank you

What do you mean by when the perspective changes? Are you talking about rotating the map around or zooming in or out? etc.

sorry for the delay, my backgrounds are 3d renders, so the perspective changes depending on the camera angle, that's why I was wondering if it was possible to have a video background, so that the perspective changes when the player moves on the map

You don't technically have to add an actual background image to a scene, but you do need to add a transparent png or webp image that has the same dimensions as you want the scene to be as the width & height of the image you assign as the scene background image is what the engine uses to automatically determine the width & height of the scene. Taking what I just said into consideration, you could create scene objects & assign the different background perspective images to those. Create a single value & link it to each of the scene objects containing the background images & then all you need to do is change the number belonging to the value to specify which scene object image should be active/visible.

While what you are wanting to do is technically possible, I don't think you are taking into consideration how much work is involved when it's comes to third person 2D games that contain multiple camera perspectives, camera angles, &/or zoom levels.