More Info ...
Could the "video sensor thingy" be as old as a vidicon, sidicon or plumbicon (all look like a glass tube with a valve connector on one end) or could it be a much more modern solid state device such as a CCD or CMOS array (look like ICs) ?
If you have a video camera why do you need to do anything other than connect it up? it must have an output ...
If anyone has a diagram of this thing they would need to know the manufacturer and model number.
Do you intend to build your own electronics "to re-use the Video Sensor thingy", what video system do you require, PAL, NTSC, SECAM ? Do you hope to build the transmitter as well or just feed a signal to a commercial transmitter ?
If we help do we get a share of your "end of Semester Score" ?