What could maybe be done instead would be a voice recorder on the intercom and a couple video cameras mounted externally to record the flight control surface deflections, pitch/bank attitude, flight visibility, approximate altitude and speed, etc.
1) Camera - No thanks.
2) CVR - That's great until I turn everything (master) off.
If I'm flying a piston single, it's probably beautiful Day VFR and I'm going somewhere to has a cheezburger.