pls help,what are motors used for the rotation for crain

You can use servos or brushless gimbal motors with respect to your need..

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This particular one uses coreless high torque motors.
As arun bhaiya said you could use brushless gimbal or high resolution servos.
But this is not suited for AV/AP.

You could use brushless servos..

can i use this motor
30RPM high quality industrial grade metal Gearbox Motor with offset shaft
for rotation camera head

Features:-

30RPM 12V DC motors with Gearbox
4500RPM base motor
6mm shaft diameter with internal hole
125gm weight
16kgcm torque
No-load current = 100 mA(Max), Load current = 1000 mA(Max)
                                                                                  OR
can u search on this website
                                     http://robokits.co.in/shop/index.php?main_page=index&cPath=2_3

Gear motors Only usedd in this equipment
Dont use servos and brushless motors..
ha ha ah ah ah..
I have seen some post use servos and brushless motor ...

They need High torque ..Gear motors 

Iam into broadcast equipments maintenance and Setup..
This is Low cost Pan tilt head Since 2 pcs In my worshop..
So If any information this u can contact me
Thanks
Seethal.m.j
www.qubexbroadcast.com

Can u show the images of the that motors Ur say to use me

Same As above pics of motor thats enough for this Head
because u can lift Heavy camera with this head
maximum 2.5 kg ..thats alll 

Geared motors are not a wise choice for an ariel gimbal, IMO.

All the RC grade/ stabilized gimbals that I've seen, use either servos or brushless gimbal motors, only because they have high resolution and better control over quick movements in contrast with geared motors which lag in precise and quick movements demanded by FPV/ariel photography and stabilization.

Also, Servos are basically just geared motors, the only thing that makes them different from any other geared motor is that they relay back their positions which enables accurate position control; geared motors (like the one in the above image) usually do not relay back their position like servos (and sensored brushless motors), so I don't think they can be used with the commercially available RC gimball drivers.

There are high-torque servos and gimbal motors, ones that outperform geared motors, they're just expensive. 

In the end of the jib arm, Pan Tilt head is mounted in which camera is mounted. Pan tilt head moves the camera with the help of remote. With pan tilt you can capture every type of angle 360 degree. Flycamdslr have wide variety of pan tilt heads.

http://www.flycamdslr.com/hdvs/proaim-spin-pan-tilt-head-pt-spn-.html