This is a mockup of an idea I had. It is for a UI interaction for recording video on your phone while editing it in a way.

To start recording, you tap and hold the “Record” button.
Move your finger off the button to pause and back on to resume recording. To stop, lift your finger, and the video is saved to the camera roll.

The button is circular for a good balance between surface area and the distance required in every direction to move your finger off it. It also grows larger when tapped, so you don’t accidentally pause when you move your finger a little.

Whether a kind of fluid blob of a button that “sticks” to your finger a little before letting go and pausing would be a neat way to indicate the threshold between recording and pause or be a flaw instead could be discovered with an actual prototype. But I have a hunch there might be a sweet middle ground somewhere.