French to English Marketing Marketing publicity video

I'm translating a description of a publicity video for a major sporting event (i.e. marketing text with sports focus).

I'm not sure if there's a proper technical term for "transition au flou".

It comes at the very end of the description of the video, after a description of the different scenes:

Signature sur transition au flou: [event slogan]

Packshot avec sound design XXXX: [event name]

Thanks!