The genre of this video is Electro house and the imagery within the video shows this by the different events taking place. the actions match the lyrics i.e "without you"  females make a love heart shape with their hands and there's a good mixture of both males and females. When usher sings he is shown in an isolated place but when the music speeds up the beat and extra instruments are played, there's a different event taking place i.e the whole crowd of people dancing to the beat of the music and when the beat of the music changes at 2.13 the colour of the shots also change into a darker luminous colour. Intertextuality is used when the dr dre headphones are shown to be used by the artist and i pad is shown to also be used by some of the people within the video.
the whole idea of the countries coming together can be representing love between people across the world as the lyrics of the song are about love hence the title of the song "without you" .