Carlon actually makes conduit designed for in-wall use. Their RiserGard is riser rated. It's an orange (low-voltage) variant on what some people call smurf tube. 3/4" is available in Home Depot, but it is easy to order sizes of 1", 1.25", 1.5" and 2" online. It is flexible, so it is very easy to put in place, relatively speaking, since it's not like solid PVC tubing. It also handles gentle turns quite naturally.
Anyway, more on topic:
WHAT CABLES DO YOU CURRENTLY HAVE?
Is it just the red/green/blue wires of component video, or is actually a full set of five wires... or actually four wires? Can you take a photo of it and post it?
The reason I ask, is because if you have 4 (or more) wires at your TV, or if they pulled cat-5e wire, then you have options.
If you have 4 wires (red/green/blue/yellow) or more:
http://www.compunetworkinc.com/Store_CompuNetwork/08_Other_Products/01_Audio_Video/03_AV_Accessories/08.html
It's pricey, but gives you 1080p video over the wiring you have in place. No walls to repair, no wires to pull.
If you have cat-5e, then that's far easier...
http://www.monoprice.com/Product?c_id=109&cp_id=10914&cs_id=1091401&p_id=10225&seq=1&format=2
Yes, your component video cabling is not what you want by itself in the wall, but there are solutions to get around it.
Also, UHD is stupid. Sorry, but there is no real source content for UHD at this time. Most UHD inputs aren't fully UHD compliant. Also, depending on the display size, and your viewing distance, you may never come close to seeing the benefits of UHD at all. About a 80" display you view from 8' away, you will see benefits, but at 12' across a room from a 55" display? Forget UHD and stick with 1080p. Forgetting the curved marketing BS.