older version of GB OS, used to have broken camera app. only what was working was gallery. if you tryed to start camera, there was error message about app. so, i needed to find as smaller and lighter app that works. and from few different apps (camera zoom, 360camera, camerafx....) i found this one. i can't give you direct link to app, but there is link
to google play. hope that admin alowes that.
after instalation, and after testing and tryng all of other free and/or payed apps, this one was smaller, simplyest and it works as it supposed. no more, no less. _after_ instalation of that app i managed to receive good, stabile (little bit laggy) pic in skype.
about smoothenes of video in skype, i already wrote, try in settings to set to low, and try with other camera with low resolution (0,3mpix will do the work).