Apps like Minimize play in background -

Here are some great alternatives to Minimize play in background - by video-mini.com :
Play Tube
Play Tube
★3.9
Float Tube - Multitasking
Float Tube - Multitasking
★4.1
Video Tube & Play Tube
Video Tube & Play Tube
★4.4
Multiple Video Popup Player
Multiple Video Popup Player
★4.3
Musepic: Repeat Youtube Videos
Musepic: Repeat Youtube Videos
★3.4
Floating Minimizer Tube
Floating Minimizer Tube
★4.3
Flow Tube : Floating Player
Flow Tube : Floating Player
★4.6
SR Player (Video Player)
SR Player (Video Player)
★4.2
Go VideoTube
Go VideoTube
★4.7
Floating Video Popup Player
Floating Video Popup Player
★3.8
PlayTube : Video & Music
PlayTube : Video & Music
★4.0
Minimizer for YouTube
Minimizer for YouTube
★3.8
Playback: background play
Playback: background play
★4.1
Music Player - MP3, MP4 Player
Music Player - MP3, MP4 Player
★4.3
Floating Tube Video Player - M
Floating Tube Video Player - M
★4.2
OneTube: Popup Music Player
OneTube: Popup Music Player
★4.6