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You will need to use either Premiere Pro or Premiere Elements to do that.
ah ok thank you! i have both of those apps but am not super familiar. how do i do that?
Video on track 2.
Photo on track 1.
Photoshop can do that no problem. As Bob says. The still image has to be the lowest in the timeline, and video above it. The video will need to be sized to reveal that part of the still image you wish to see in the rendered video, or you can mask it. Photoshop does not do Green Screen where a cutout of a person, for instance, moves over the still image background. You will need Premiere Pro or After Effects to do that.
I hope you can work this all out from the screen shot, and you might need to click to expand to see in more detail
Video Group 1 is a layer filled with black with white brushed writing and a rainbow stripe
Video group 2 is a video.
In order to resize the video goup, you need to make it a Smart object. You can then Free Transform it.
Alternatively, you can add a layer mask to the video group 2 'layer' and paint with black where you want the background to show through. As in where the rainbow is revealed behind the black circle in the layer mask.
One thing with the still image layer is that it will need to be dragged out to fill as much of the timeline as required
Or you can place multiple still image layers into a video group, and drag them out to show for the required time.
Note that you might need to use the zoom tool to be able to drag in the right place.
I'm sure you got it all way back up the thread, but please ask if you need more details.