This is definitely not meant for recording your bike ride, or anything that requires full attention from both eyes. This is meant for making videos of instructables and documenting non life-threatening activities.
Step 1: Materials
A small scrap piece of cardboard.
A small strip of stretchy fabric ribbon
A sharp blade
Step 2: Cut a Rectangular Hole in Cardboard (optional)
cut out the cardboard using the plastic lens from the goggle as the template and cut a rectangular hole out of the circular piece of cardboard. This serves as a rangefinder for your eye, so you get a sense of what is in the camera's view. This step is optional.
Step 3: Camera Strap
Cut a small hole in the stretchy fabric ribbon for the zoom lens portion of your camera. You could probably use rubber bands instead of the stretchy ribbon.
Mount it onto the goggle by sandwiching it between the lens and the goggle frame.
Step 4: Mount It and Wear It
Mount the goggle frames and wear it.