Honestly, if you own an iPhone or a Droid phone most of these phones now a days have really decent abilities to take nice pictures and videos and that should be enough for the time being until you can invest in better equipment. You can even use a simple boxed digital camera is also good to use as long as you get a memory card that has at least 16 GB so that you have enough space to fit your entire talk into the camera. Make sure your battery is fully charged and in video mode.
Another option is a Kodak VI 8, which is a flip camera that you can buy for about $200. It will not be great but if it’s just for personal career development use then it will do the job.