You're referring to the popular reality TV show "I'm a Celebrity...Get Me Out of Here!" and its use of the libvpx video codec.
In terms of video encoding, "I'm a Celebrity...Get Me Out of Here!" likely uses a combination of and VP9 codecs, with libvpx being used to optimize video quality and reduce file sizes. i'm a celebrity...get me out of here! season 13 libvpx