Don't get anxious about the size of this post - I'm just being
excessive helpful (or trying to be) ... and don't let me dissuade you from continuing with further videos.
First suggestion - and it's perhaps THE most important for any photographic exploit is...
Lighting.
- The overall light level needs to be greater. You can tell it's insufficient when you see large dark areas that are showing noise (the grainy looking effect).
- Next is lighting position - be careful where your lights are as reflections can be a problem, washing out parts of the scene.
- White balance. All lighting (even daylight) affects how colours are presented. This can be compensated for by setting the 'white balance'. Not all equipment has this facility and some that do only have presets. To get the best white balance, you really need a camera that can do the full exercise using a white card (or grey card) - and you need to do it every time the lighting changes. (Note: lights need time to 'warm up' as their brightness and colour change over time. Allow half an hour, depending on your lights, then do the white balance and your shoot.)
- Shadows. Just be aware where the shadows are and if they will be a problem.
Reflections. Just be aware of shiny surfaces on your subject - or you could end up with images that show other stuff in the room. This could simply be distracting, or embarrassing. Depends on what you have in the room.
Framing. Just be aware where you are in the frame. It can be easy to drift out of view.
Speech. You were a little hesitant in your presentation - but don't worry. It's a confidence thing - and if you keep going, you'll have that sorted out in no time.
Repetition. Not a big issue, but when you've read out the information on one side of the box, you can simply say "... and it's the same on all four sides" as you turn it through. Stopping on each face didn't add anything but time. Again, just keep at it and you'll soon settle into a 'zone'.
Terminology. Use words that help. 'AUX' is not a word we say very often, if at all. We see 'AUX' and say 'auxilliary'. Also, when describing the mode switch, you did not introduce it as a mode switch or selector switch - we had to work that out from your reading the settings out. Not a big issue, but something that would add to the presentation IMHO.
In describing "What you get inside the box" you didn't actually mention the unit itself. You also missed pointing out the telescopic aerial. Again, don't worry too much about this sort of thing. It's going to happen now and then - but just be aware and try not to do it too often.
Preparation. If you're going to have things like a CD player - find a CD and keep it on hand. Also, if you want to demonstrate the Auxilliary input with a mobile - have the mobile ready to press 'play'. Watching someone fiddle with their phone gets tiresome pretty quickly.
And on the issue of playing copyrighted material, make sure you keep the samples short (which you seemed to be doing

) or else you could fall foul of the copyright police and your video gets pulled.
Edit: Spelling