Hi,
S-video, or composite video only would both require extensive processing in order to seperate the R,G, and B parts.
If your DVD player happens to have a SCART, then that *should* have the lines for R,G and B seperately, as well as the composite signal for horizontal and vertical sync. It'll be very tricky though, as others pointed out, the frequency of scan will be different. The horizontal/vertical scan frequency would probably require some tweaking, that is, use the sync from the scart as a reference and generate a horizontal scan frequency thats in sync but higher in frequency. It gets complicated very quickly. I seem to remember phillips doing a 'one chip' solution for conversion, don't know if they do samples, I've got a 7" TFT that has a phillips PAL/NTSC decoder on board, generates all the timing necessary (for the syncs...you just connect the RGB lines straight trough for VGA) , part number is obscured though, sorry. Unless you really want to build something and are well versed in electronics, probably not advisable to prototype.
Blueteeth.
Ps. Can't say I know much about video, just the basic's, like running a small (controllerless) TFT from VGA, and very basic PAL/NTSC knowledge, so don't take this seriously.