Many people that might can't get your suggestion, I expected from you to provide/clarify the suggestion with more details/photos. Thats why for now, none voted for this. @Mask
I tried to do it, but unfortunately I couldn't create a photo / video about it since it is very complicated, but the free camera would be like in a car but in the crane.
What's free camera, crane has /camcr 0 (if this what you mean by free camera).