If you see the video. DOF is already done. But it is hurting bad. It is not in front of camera and in this case it is unbelievable time intensive to catch the right values. Also it takes a lot of rendering time on my 8CPU machine because it seem to use only one CPU.
Please advice how to auto-calculate or calculate the distance of DOF in relation to the camera. If there is any solution, I would love to create more videos :-)
Oh, oops. I didn't look at the video, my computer can't play videos and render at the same time too smoothly. The easiest way to adjust DoF by far is to go onto render window, and change "Mouse click function" on the bottom of the window to "Set depth of field focus point". This will set the DoF focus distance and which bit of the visible screen to focus on when you click on a part of the render window. Remember, change it every keyframe, and if you use DoF have keyframes close together.