I'd like to record RGB images that were uploaded by Unity Engine using Kinect.

using UnityEngine;
using System.Collections;
using System.IO;

public class ScreenRecorder : MonoBehaviour {

    public int maxFrames; //amount of frames you want to record before closing the game

    int shotCount;

    void Awake () {
        Application.targetFrameRate = 1; //forces frame rate to 1
        if (!System.IO.Directory.Exists("Screenshots")) //check if "Screenshots" folder exists
        {
            System.IO.Directory.CreateDirectory(Application.dataPath + "/Screenshots");
        }
    }

    void Update () {
        if (shotCount <= maxFrames) //we don't want to include the first frame since it's a mess
        {
            Application.CaptureScreenshot(Application.dataPath + "/Screenshots/" + "shot" + shotCount + ".png");
            shotCount += 1;
        }
        else //keep making screenshots until it reaches the max frame amount
        {
            StopRecording(); //quit game
        }
    }

    public void StopRecording() //you can call this function for different reasons (e.g camera animation stops)
    {
        Application.Quit();
    }
}