There are lots of cheap GoPro type cameras on Amazon.
I recently bought one for about £40 to mount on my bike and the video quality is very good.
As you need to view on an iPad you could simply get a Lightning to SD Card reader. I did that some time ago and it worked ok.
Hi,
I have very recently started cycling. I'm 65 and disabled and feel the bumps so ..... I bought a Zoom Suspension Seat Post from Amazon for £25.
For me it has been worth the price and was very easy to fit.
I just had to play around with the tension setting a few times to get it just right for me ..... I'm 16.5 stones.
Steve