Literally. Well almost. 2 meaningful lines + some boilerplate. This has got to be easier than even Python!
Using EmguCV, a wrapper around OpenCV and F# Interactive:
#I @"C:\<project directory>\packages\EmguCV.3.0.0\lib\net451" #r "Emgu.CV.dll" #r "Emgu.Util.dll" #r "System.Windows.Forms" open Emgu.CV open System.Windows.Forms let capture = new Capture() Application.Idle.Add(fun _ -> CvInvoke.Imshow("Camera", capture.QueryFrame()))