Wikitude

Overlay Image on Live Camera feed

I have gone through all the samples of wikitude.Is it possible to overlay live camera feed image which has been saved as screenshot and create augmenetd image?If it is possible then what tracker image should i use?because tracker image is the one which i know presently that which image i am going for track.Then if the image will be taken in future how can i create .wtc  file for that and how can i augment my camera feed?Is it possible in wikitude?Please help !!

I have to create one application using wikitude.I like the sdk of wikitude.

what you are looking for is creating target images on the fly, by taking screenshots of the camera view. This is currently not supported. We've already thought about this feature and might be adding it in a future SDK version.