Hey @test_voot,
On AVPlayer it's not possible (Known Limitation), since our SDK is based on AVPlayer (The only iOS core player) you can't set a bitrate with our SDK.
Apple attached some API from iOS8 for preferredPeakBitRate:
https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVPlayerItem_Class/index.html#//apple_ref/occ/instp/AVPlayerItem/preferredPeakBitRate
This will be supported in future version on our SDK.
Thanks!