Weird title, I know. I am trying to start a new YouTube career. Before I start making videos (mostly because I lack certain resources most of the time) I wanted to try to up the production value of my soon-to-be-made videos by creating ready-to-use transition effects. Blah blah blah and I need to apply the effects to all video sources (at least three), but only to a portion of the screen. I discovered the Video Output FX option above the preview window and it does what I need in terms of applying the effects to the video sources. I haven't yet discovered how, or even if, I can apply these effects to a portion of the output video.
I have found a workaround where the effects I want to be constant across the entire screen can be put into the previously named button and then render it. I then load the outputted video into a new project, duplicate the video track as a new source, apply the other effects, and use the cookie cutter to remove effects from where I don't want them. More specifically, I used the Add Noise plugin in Video Output FX before rendering the video. I loaded the rendered video into a new project and copied the video track as a new source. I applied the TV Simulator plugin to the first video track and chained the Cookie Cutter plugin to remove the left half of the first video track and reveal the left half of the original video. I rendered this as the final cut.
Is there a way to do all of that without needing to render multiple videos? I believe one option is to duplicate all of the video sources (taking three and making six!) and doing with them what I did to the first rendered video (apply effects, use cookie cutter).