mobile support may not available as if now because of the kaltura dependency. But we may work on it and may release it as far feature.
Definitly to upload contents, youshould have partnerID from kaltura ,also there are bandwidth and space limitations.
But not to worry…Using KalturaCE (Kaltura Community Edition;Kaltura’s Open Source Solution), you can configure “your own Media Server” !!! and Buddypress-Kaltura Component provides flexibility to configure itself with either kaltura.com or your own KalturaCE.