I hope it will be usefull you guys when you starting this journey of mocap yours.

Hatsune Miku ipi Soft mocap singing and tutorial
https://youtu.be/O_kJyoZcHIE

s2sfm release miku gman backstages from 0 to final and iPi soft tutorial for source 2 sfm
https://youtu.be/F95vPZI2mD8

Thanks for the videos. In the second video, how did you get the rig? Whenever I try to export the videos nothing shows up, because it is all MDL files

I think you are talking about sfm if its here;
1. Open SFM and create scene load map.
2. Add your model.
3. Right click your model and and go export and in export press animation.
4. In export animation menu tick to Ascii (this is importand or else ipi mocap can't import)
5. Press export.
6. Than import exported .dmx from sfm to ipi stidio.
6. You ready to go.

In here
19:32 starting
https://youtu.be/F95vPZI2mD8?t=1172