Can after market power window be installed?

For the installation of the power window, we would suggest you to contact the service center or the dealership as they have a separate department of accessories where you can get the work done. If you get it installed from the outside then there are chances that your car warranty will lapse as the installation will require some cuts on the wire. However, consulting with the authorized service center and the dealership would be a great move. You can click on the following link to see the details of the nearest service center and selecting your city accordingly - Service Center.

Kya Main Celerio Kar Main power window Laga sakta hu Iska kharcha Kitna Aata Hai

Is it possible by adding power window outside it will cut the wire ?

Yes