Hi Kaliya,
I guess you are using the AllVideos plugin in K2?
If so, you would have to ask that at the joomlaworks forums as K2 is just handling what Allvideos is coded to use.
If you need blip.tv added, then you should request that there, or the alternative would be to use URL option.
Also, have you read the AllVideo documents?
www.joomlaworks.gr/content/view/35/41/
Simon
K2 Support