From Sytexis Software:
PlayClaw operates completely in background and makes full use of your CPU's multi-core abilities to record high-quality action videos of your 3D games without affecting the gameplay or reducing frame rate. PlayClaw records smooth, full-resolution high-FPS video sequences accompanied by the game's original audio track and sound effects. Real-time chats could never been easier. The tool supports Teamspeak and Ventrilo overlays, displaying nicknames of who's speaking right over the game. Unlike many of its older competitors, PlayClaw recognizes and fully employs advanced acceleration features of modern video chipsets, allowing performing these tasks without affecting your gameplay or the game's frame rate.