Please go to the Toshiba Europe Support website and download the required driver for your device.
Go to third selection model and choose Satellite as Family, Satellite P755 as Series and Satellite P755-XXX where * is the model on the back of the sticker. Choose the corresponding model, then select the search parameters according to the OS information installed in your computer and navigate through the drivers' list and look for Webcam driver**. Download and install it and you'll have a working webcam.