The technology used in this case is the same as that widely employed during the broadcast of sporting events to display advertisements on billboards.

The CBS emblem in this single frame of a live video broadcast was digitally inserted during the New Year's Eve
broadcast so as to conceal the NBC emblem that was on display in the background. The technology used in this case is
the same as that widely employed during the broadcast of sporting events to display advertisements on billboards.

/app_steemit