Hi @sandybgya ,
Here’s a link to the ifixit [guide|89285] guide.
Alternatively, here’s a link to the [http://content.etilize.com/User-Manual/1031003169.pdf|service manual] for your Chromebook.
Scroll to p.43 to view the necessary pre-requisite steps and then the procedure to get to the camera /microphone module.
ifixit does not have this particular spare part.
If you search online using the part number '''783088-001''' ''only'' in the search box of your browser, you’ll get results of suppliers of the part.
Hopefully this is of some help.