Editing: circle border

One of our hardest tasks in the editing process so far was getting Tayla into a circle border, as seen in Banks' Brain video. This is because our main editing software is iMovie, however the only 'picture in picture' shape available is a small rectangle. Fortunately, we also have access to Adobe Premiere and (using a tutorial we found online) we have therefore been able to create the effect we desire:
 

example using footage from the forest

Here is the tutorial we found, which helped us achieve this:

We can also alter the colour and quality of both layers of footage in both iMovie and Adobe Premiere, allowing us to have full control over how the background and foreground look. We have a wide range of raw footage which we can use as a background in this shot, which we are currently playing around with, to adhere to the lyrics of our song/narrative.