---
title: "init(_:frameAnalysisSpacing:)"
framework: vision
role: symbol
role_heading: Initializer
path: "vision/trackopticalflowrequest/init(_:frameanalysisspacing:)"
---

# init(_:frameAnalysisSpacing:)

Creates an optical-flow tracking request.

## Declaration

```swift
init(_ revision: TrackOpticalFlowRequest.Revision? = nil, frameAnalysisSpacing: CMTime? = nil)
```