Because video poker machines (at least in the USA) have to operate as if each hand was dealt randomly from one 52 card deck the odds are manipulated by changing the payouts. I did a quick search and found the following charts showing the odds of the varous machine payouts. The 9/6 refers to the full house/flush payout.
<TABLE><TBODY><TR align=middle><TD>[font=verdana,arial,helvetica]ODDS BETWEEN DIFFERENT MACHINES[/font]</TD></TR><TR><TD><TABLE borderColor=#006000 cellSpacing=1 width=280 align=middle border=5><TBODY><TR><TD class=category31 align=middle>Machine type <TD class=category31 align=middle>Payout <TR><TD class=category13 align=middle>10/7 (double bonus) <TD class=category13 align=middle>100.2% <TR><TD class=category13 align=middle>9/7 <TD class=category13 align=middle>100.7% <TR><TD class=category13 align=middle>9/6 <TD class=category13 align=middle>99.5% <TR><TD class=category13 align=middle>8/5 <TD class=category13 align=middle>97.3% <TR><TD class=category13 align=middle>7/5 <TD class=category13 align=middle>96.3% <TR><TD class=category13 align=middle>6/5 <TD class=category13 align=middle>95.2% </TD></TR></TBODY></TABLE></TD></TD></TR></TBODY></TABLE>
<TABLE><TBODY><TR align=middle><TD>[font=verdana,arial,helvetica]HAND ODDS (9/6 JACKS OR BETTER)[/font]</TD></TR><TR><TD><TABLE borderColor=#006000 cellSpacing=1 width=280 border=5><TBODY><TR><TD class=category31 align=middle>Hand <TD class=category31 align=middle>Payout <TD class=category31 align=middle>Frequency <TR><TD class=category13 align=middle>Royal Flush <TD class=category13 align=middle>4,000 <TD class=category13 align=middle>1 in 40,390 <TR><TD class=category13 align=middle>Straight Flush <TD class=category13 align=middle>250 <TD class=category13 align=middle>1 in 9,148 <TR><TD class=category13 align=middle>Four of a Kind <TD class=category13 align=middle>125 <TD class=category13 align=middle>1 in 423 <TR><TD class=category13 align=middle>Full House <TD class=category13 align=middle>45 <TD class=category13 align=middle>1 in 86 <TR><TD class=category13 align=middle>Flush <TD class=category13 align=middle>30 <TD class=category13 align=middle>1 in 90 <TR><TD class=category13 align=middle>Straight <TD class=category13 align=middle>20 <TD class=category13 align=middle>1 in 89 <TR><TD class=category13 align=middle>Three of a Kind <TD class=category13 align=middle>15 <TD class=category13 align=middle>1 in 13 <TR><TD class=category13 align=middle>Two pair <TD class=category13 align=middle>10 <TD class=category13 align=middle>1 in 7 <TR><TD class=category13 align=middle>Jacks or Better <TD class=category13 align=middle>5 <TD class=category13 align=middle>1 in 4 </TD></TR></TBODY></TABLE></TD></TD></TR></TBODY></TABLE>
<TABLE><TBODY><TR align=middle><TD>[font=verdana,arial,helvetica]Payouts- 9/6 JACKS OR BETTER[/font]</TD></TR><TR><TD><TABLE borderColor=#006000 cellSpacing=1 width=350 border=5><TBODY><TR><TD class=category31 align=middle>Number of Coins <TD class=category31 align=middle>1 <TD class=category31 align=middle>2 <TD class=category31 align=middle>3 <TD class=category31 align=middle>4 <TD class=category31 align=middle>5 <TR><TD class=category13 align=middle>Royal Flush <TD class=category13 align=middle>250 <TD class=category13 align=middle>500 <TD class=category13 align=middle>750 <TD class=category13 align=middle>1000 <TD class=category13 align=middle>4000 <TR><TD class=category13 align=middle>Straight Flush <TD class=category13 align=middle>50 <TD class=category13 align=middle>100 <TD class=category13 align=middle>150 <TD class=category13 align=middle>200 <TD class=category13 align=middle>250 <TR><TD class=category13 align=middle>Four of a Kind <TD class=category13 align=middle>25 <TD class=category13 align=middle>50 <TD class=category13 align=middle>75 <TD class=category13 align=middle>100 <TD class=category13 align=middle>125 <TR><TD class=category13 align=middle>Full House <TD class=category13 align=middle>9 <TD class=category13 align=middle>18 <TD class=category13 align=middle>27 <TD class=category13 align=middle>36 <TD class=category13 align=middle>45 <TR><TD class=category13 align=middle>Flush <TD class=category13 align=middle>6 <TD class=category13 align=middle>12 <TD class=category13 align=middle>18 <TD class=category13 align=middle>24 <TD class=category13 align=middle>30 <TR><TD class=category13 align=middle>Straight <TD class=category13 align=middle>4 <TD class=category13 align=middle>8 <TD class=category13 align=middle>12 <TD class=category13 align=middle>16 <TD class=category13 align=middle>20 <TR><TD class=category13 align=middle>Three of a Kind <TD class=category13 align=middle>3 <TD class=category13 align=middle>6 <TD class=category13 align=middle>9 <TD class=category13 align=middle>12 <TD class=category13 align=middle>15 <TR><TD class=category13 align=middle>Two Pairs <TD class=category13 align=middle>2 <TD class=category13 align=middle>4 <TD class=category13 align=middle>6 <TD class=category13 align=middle>8 <TD class=category13 align=middle>10 <TR><TD class=category13 align=middle>Pair of Jacks or Better <TD class=category13 align=middle>1 <TD class=category13 align=middle>2 <TD class=category13 align=middle>3 <TD class=category13 align=middle>4 <TD class=category13 align=middle>5 </TD></TR></TBODY></TABLE></TD></TD></TR></TBODY></TABLE>
One last note. These odds are based on perfect play. Video poker is different than slots in that the player can increase the house edge if they play poorly.