I ran across this mini-camera post on another forum and thought you might be interested. rickwade posted this video:
Note that it adjusts it exposure automatically. The camera is 1" x1" x 0.8". The recarbattery is contained within that volume. It interfaces with a mini-USB port. All for $22.00.
Here's a link to it on Amazon. Amazon.
Product Description:
☞High quality images FULL HD 1080P DV DC
☞Import OV9712 HD camera lens
☞Mini shape,portable handheld DV
☞Record high-definition video in low-light conditions
☞Option video format :1920x1080P ,1280x720P ,Motion detecting video: 720P,1080P
☞Photo mode: 12M(4032x3024)
☞USB2.0 interface
☞Support TF card 32GB(TF card not include)
☞Support TV out TV camera connection
☞Built-in lithium battery 200mAh, work time about 100 minutes
☞Support system: Windows me/2000/XP/2003/vista;Mac os;Linux
☞ Charging voltageC-5V
☞ Interface Type: MINI 8 Pin USB
☞ Battery Type: High capacity polymer lithium electricity
☞ Size: 2.5*2.5*2cm(L*W*H)
☞ Net:26g, Weight:80g
Package Included:
☞1 x Mini Hidden Camera
☞2 x Brackets
☞1 x User Manual
☞1 x USB cable
Jan