Instead of manually moving camera it was easier for my just to use Unity`s built in feature to record an animation. It is pretty straightforward, I just clicked on camera in upper tab chose Window and opened Animation tab, next I clicked to add a new animation. When the location for the new animation was specified I pressed red circle in Animation tab to record my camera. There is such long bookmark symbol in Animation tab it adds a key frame. I added it at the beginning, having my camera in initial position and at the end, moving my camera to the final position. Then I stopped recording by again pressing red circle in Animation tab. Here my animation was ready and the only thing I should have to do was to use my knowledge of animating in Unity.
Then I got a problem of needing to create more than one animation with the same GameObject. It was easy tackled by just clicking on the name of the current animation under red circle button in Animation tab and choosing created beforehand blank animation and filling it with the content I needed.