If you have heard the music that is embedded in these videos, envato markets them as audiojungle that are sold separately. They also have plug ins that they sell separately. These extra components are often available here if you look by their marketing name (not videohive).
For e.g., if you are looking for audio clips in these videos, there a millions here. The keyword for that is audiojungle.
The query [Login to see the link] gives more than 600 hits and most of these are mega packs.
Each mega pack contains hundreds of clips.
Take the clip you want.