If you want to overlay dynamic video on the captured video, you can go to Download Center > Capture SDK to download SDK, and then refer to the examples in the SDK folder for custom development:

• 64-bit system users can view the sample program (OSDPreview.exe) under SDKv3\Bin\x64\Release.
• 32-bit system users can view the sample program (OSDPreview.exe) under SDKv3\Bin\Win32\Release.
• View the source code for the sample program under SDKv3\Examples\VC++\GUI\OSDPreview.