So what you're wanting to accomplish is to add the videos to your catalog so you can organize them better? LR is capable of this. You can choose what you want to add (import) to the catalog, be it photos or videos, or both.
You need to know where the videos are currently stored on your system. In the Import module, navigate to where they currently reside and select that folder. You should see thumbnails in the preview pane, along with checkboxes. If both photos and videos, just select the videos. Since the videos are already on your computer, you will ADD them, so LR will not be moving them at this point. However, you can choose the MOVE option.
If you choose the MOVE option, on the right side navigate to the DESTINATION panel, choose where you want to move them. You can create a folder, using your naming structure, ie; date. LR will move those videos into that folder. Doing this does relocate the videos on your system. It's using the OS, just like Explorer or Finder would. LR will create the folder on your system.
IF you use the ADD option for importing, LR does not move them, just adds them to the database. After they have been added, you can use the Library module, Folders to create new folders, and to move them. If you're wanting LR to keep track of them, remember to do all moving from within LR.
I hope that helps with what you're wanting to accomplish. With videos, LR is limited to managing, no editing.