Controls to keep target in center of video are hardcoded to 1280x720 video input

The original video capture from the Jetson was set to 1280x720 - this is the size of the image that the camera captured and passed to the detection, tracking, localization, controls, etc. If the video capture size changes - for example if using an 8MP camera and using the full 8MP with mode 0 in gstreamer results in a 3280x2464 sized image. If the goal is to keep the target in the center of the frame then the center of this image is 1640, whereas in the 1280x720 image the center would be at 640. Add parameters to account for this.