Sorry to say so, but none... That platform is so outdated it won't be able to do any hardware supported encoding/decoding and lacks horsepower necessary for modern video formats. There is also a risk your machine has old AGP slot and misses PCI express. With PCIe modern graphic card you might be able to do some things with video, but heavy duty is out of question, slow cpu, ram and disk won't be able to keep up.
"Pentium 4" covers a wide range of processors released from 2000 though 2006, so depending on which processor it is, it might be "ancient" or just "pretty old". If it were one of the "newer" ones, then the system might have a PCI Express slot that may be compatible with video cards capable of decoding and encoding video reasonably well.
The processor and other components would probably hold back the system's performance when running "heavy duty recording apps" though, even if the software were able to offload much of its work to the GPU.