As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I've been developing apps and frameworks for several years (since I was in college). Pre-Vuo projects include Kineme Quartz Composer plugins, iOS apps for education, an app that analyzes photographs of tomato slices, and software to help people with disabilities use talking keyboards.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
@ou, I've turned your question into a feature request, since Vuo doesn't currently have any blob tracking built in, and that would be a great addition.
In the meantime, you may be able to use some external software that tracks blobs and sends OSC data to Vuo. One that I have heard of, but not tried myself, is KVL_Kinect_Tracker.
To implement a blob tracking node in Vuo, we're considering integrating a piece of software called OpenPTrack. Since OpenPTrack can output UDP messages, an alternative to this feature request would be Send and receive data via TCP and UDP. It would be more general-purpose (support communicating with other things besides OpenPTrack) but would mean you'd have to handle the UDP messages from OpenPTrack within your Vuo composition, rather than having a node that converts them to tracking data for you.
Well, the Hold Value can't go between Receive OSC Messages and Filter Skeleton, because Filter Skeleton can't skip any of the messages. (NI mate sends a series of messages for each frame. When Filter Skeleton gets the whole frame, it emits an event.)
The earliest point where you could insert a Hold Value is after Filter Skeleton. The reason I didn't suggest putting it there is because you'd have to put a whole bunch of Hold Value nodes, one for each output of Filter Skeleton. Anyway, it's probably just fine to put the Hold Value a bit later in the chain. The math and list stuff just after Filter Skeleton probably isn't as performance-intensive as the graphics stuff at the bottom.
@Scratchpole, the user manual for the UA-25 says you need to set the Advanced switch to On in order for the sample rate switch to have any effect, and then you have to disconnect and reconnect the UA-25. After that, does it work in Vuo?