> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/holoscan/sdk-user-guide/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/holoscan/sdk-user-guide/_mcp/server.

# holoscan::ops::video_io::register_video_acquisition_enumerator

> Register a capability enumerator for video acquisition.

```cpp showLineNumbers={false}
void holoscan::ops::video_io::register_video_acquisition_enumerator(
    const std::string &backend_id,
    VideoCaptureCapabilityEnumerator enumerator
)
```

Register a capability enumerator for video acquisition.

Multiple enumerators may be registered per `backend_id`; results are concatenated in registration order. Vendor extensions should use a distinct backend\_id (e.g. "vendor.example").

**Parameters**

**`backend_id`** `const std::string &`

Non-empty identifier for the stack or vendor integration.

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**`enumerator`** `VideoCaptureCapabilityEnumerator`

Callable that returns [`VideoCaptureCapabilities`](../structs/videocapturecapabilities) without starting a pipeline.

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