OpenCV does not have an API for listing capture devices. The sample shows how to create a Python extension to invoke DirectShow C++ APIs for enumerating capture devices.

• Microsoft Windows SDK
• Python 2.7.9 / Python 3.6.5
• OpenCV 3.3.0

• Python > 3.6
• OpenCV > 3
• Build Tools for Visual Studio 2019 with Windows 10 SDK

• Python >=3.5 --> Visual C++ >=14.X
• Python >=3.3 and <=3.4 --> Visual C++ 10
• Python >=2.6 and <= 3.2 --> Visual C++ 9
• More information here

1. Install Python 2/3 64 bits
2. Install Opencv >3.0
3. On CMD: pip install --upgrade setuptools --> This upgrade the setuptools
4. Microsoft Visual C++ 14.2 standalone: Build Tools for Visual Studio 2019 (x86, x64, ARM, ARM64):
   • This is a standalone version of Visual C++ 14.2 compiler, you don't need to install Visual Studio 2019.
   • Install Microsoft Build Tools for** Visual Studio 2019** info and Download [here] 4
   • In Build tools, install C++ build tools and ensure the latest versions of MSVCv142 - VS 2019 C++ x64/x86 build tools and Windows 10 SDK are checked.

1. Configure Visual Studio environment:

   • Visual Studio 2010 (VS10): SET VS90COMNTOOLS=%VS100COMNTOOLS%
   • Visual Studio 2012 (VS11): SET VS90COMNTOOLS=%VS110COMNTOOLS%
   • Visual Studio 2013 (VS12): SET VS90COMNTOOLS=%VS120COMNTOOLS%
   • Visual Studio 2015 (VS14): SET VS90COMNTOOLS=%VS140COMNTOOLS%
   • Visual Studio 2019 (VS16): SET VS90COMNTOOLS=%VS160COMNTOOLS%

   If you are using Visual Studio 2019, use the following command:

   SET VS90COMNTOOLS=%VS160COMNTOOLS%
   

   Or, search x64 Native Tools Command Prompt for VS 2019 in your menu windows, and don't need use the SET variable before

2. Add your Windows SDK lib path to setup.py:

   from distutils.core import setup, Extension
   
   module_device = Extension('device',
                           sources = ['device.cpp'], 
                           library_dirs=['C:\Program Files (x86)\Windows Kits\10\Lib']
                       )
   
   setup (name = 'WindowsDevices',
           version = '1.0',
           description = 'Get device list with DirectShow',
           ext_modules = [module_device])

3. Build the Python extension

   Python 2

   python setup.py build install
   

   Python 3

   python3 setup.py build install
   

4. Run the app and select a capture device:

   Python 2

   python test.py

   Python 3

   python3 test.py

   

Listing Multiple Cameras for OpenCV-Python on Windows