Google Glass has a 5MP sensor, which can capture video at 720p, but given its size, the quality probably isn’t stellar.
In the use cases you mentioned, GoPro is the better choice. The most expensive model costs one third of Google Glass and captures 1440p at 48fps. It takes photos at 12MP and has advanced stabilization features built in. The GoPro is already the go-to sports accessory, I don’t see how Google is going to disrupt this market given its price and lackluster camera specs.
Imagine Glass being used by a golfer. No need for a golf tracker device. You can easily see how far you are from the hole, wind speed, etc.
Imagine Glass being outfitted into the helmet. Watching football will not be the same. Seeing the perspective of the quarterback when he is about to throw the ball makes watching the sport more exciting.
There are, and have been, more suitable products for that. I don’t think this is the use case Google has in mind for Glass. Google Glass is meant to be way more personal, collecting your movements and augmenting your physical world with content that Google has selected for you based on the information they have on you.
In the use cases you mentioned, GoPro is the better choice. The most expensive model costs one third of Google Glass and captures 1440p at 48fps. It takes photos at 12MP and has advanced stabilization features built in. The GoPro is already the go-to sports accessory, I don’t see how Google is going to disrupt this market given its price and lackluster camera specs.