When you are looking for a webcam for your basic video calling/video conferencing needs, you must be aware of the fact that quality of the image/video streaming will benefit the person sitting on the other side.
Now, coming to the best webcam under Rs 1000, you may consider to take a look at the Logitech C110 webcam. Priced at Rs 950, this device offers its users with direct plug and play feature, which means you won't have to install it's software separately. The picture and video quality is very impressive as well as the internal mic is quite strong. If you have a decent internet connection of 512 kbps bandwidth, then this is the best webcam that will suite your needs.
If you can spend a few bucks more, you can get a better webcam that not only delivers a crystal clear picture and 720p video, but also has a wide variety of features. The Zebronics Crisp HD webcam offers 24 mega pixels image resolution at interpolation mode which can be activated from settings. This webcam offers plug and play only in windows 8, but software is provided in the package, so there is not much of an issue. The efficiency of this webcam, according to me is the best as it delivers top notch streaming to the user on other side along with a great sound quality and even if you have a slower bandwidth of 256 kbps, it does it's job flawlessly. This webcam is priced at Rs 1050.