The web cam cannot be turned on without a program to run it , skype for example or messanger , there may be a photo program in the laptop which will help you access the web cam but you'll have to find it . Heres a windows search with multiple web cam programs to select from
https://www.google.ca/search?q=webcam+access+programs&biw=1920&bih=916&source=lnms&sa=X&ved=0ahUKEwi4zduGpZjQAhUj5oMKHT1zB4cQ_AUIBSgA&dpr=1#q=pc+web+camera+software+free+download
Hope this helps