How to replace battery?

@mahi2343 since iFixit does not yet have any guide for your computer model, use something like this video to replace the battery.

To replace the camera you need to know that it is located above teh LCD. To get to it you will have to reassemble the top cover. Check this video for a generic idea for the Asus computers.On some model these LCD's are glued to the cover and it may be difficult to remove it. I seem to remember that the last Zenbook I've worked on had a glued display. Check something like this video This maybe better to leave the existing camera and just get an external camera.We will need to know your exact computer model.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!