It is possible, and in fact most Mercury imaging is done during the day. That being said, it requires some attention to details that aren't necessary for normal imaging. Above all, you need to be mindful of the Sun. It is useful to align on the Sun, but be careful with your solar filer so you don't accidentally cross paths with the Sun while it is not in place.....this will destroy your camera in the best case, and yours eyes in the worst case.
I'm considering doing some Mercury imaging this summer, but haven't gotten around to it yet. Whether or not it's easy to find on the camera depends on your mount, and the size of your camera sensor. You will be blindly pointing at Mercury, and if you can't get it on the sensor it will be impossible to locate manually. Careful alignment to the stars the night before the attempt is useful to ensure that your pointing accuracy is good enough. From there, you have several available methods. You could align on the Sun the next day and then slew to Mercury, but this depends upon the accuracy of the solar alignment and your camera sensor size. Alternatively, you could align very accurately on stars the night before, and then slew to the RA and Dec coordinates that you know Mercury will be located at a very specific time the next day, and then leave the scope locked in that postion, and only turn it on and start tracking again at the aforementioned time the following day. Needless to say, it can take quite a bit of work to achieve this. Mercury is located some 25 degrees from the Sun right now, so this is plenty of room, although its magnitude is about 0.67, so it's not very bright against the sky. Good luck!
Edited by Tom Glenn, 26 June 2019 - 08:14 PM.