Re: [mediacapture-image] Does PTZ look good to you? (#263)

I know relative was more what we finally implemented, but let me see if we got absolute working as well.

Below is the code for UVCControl lib and that Logitech camera

this.uvcCamera = new UVCControl(1133, 2143);

ptz(action: string): void {
    switch (action) {
      case "up":
        this.ptzCommandRelative(0, 1);
        break;
      case "down":
        this.ptzCommandRelative(0, -1);
        break;
      case "left":
        this.ptzCommandRelative(1, 0);
        break;
      case "right":
        this.ptzCommandRelative(-1, 0);
        break;
      case "stop":
        this.ptzCommandRelative(0, 0);
        break;
      case "zoomIn":
        this.ptzCommandZoomRelative(1);
        break;
      case "zoomOut":
        this.ptzCommandZoomRelative(-1);
        break;
      case "zoomStop":
        this.zoomStop();
        break;

      default:
    }
  }
  ptzCommandRelative(pan: number, tilt: number): void {
    // PAN  1=left -1=right
    // TILT 1=up -1=down
    const buffer = Buffer.alloc(4);
    buffer.writeIntLE(pan, 0, 2);
    buffer.writeIntLE(tilt, 2, 2);
    this.uvcCamera.setRaw("relativePanTilt", buffer).catch(console.error);
  }

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